Quantification of Lewis acid sites in 3D and 2D TS-1 zeolites: FTIR spectroscopic study
Publication date: Available online 14 October 2019Source: Catalysis TodayAuthor(s): Mariya Shamzhy, Jan Přech, Jin Zhang, Valérie Ruaux, Hussein El-Siblani, Svetlana MintovaAbstractTitanium silicalite 1 (TS-1) zeolite is an important selective oxidation catalyst. Recently prepared layered and pillared forms expanded the application of TS-1 to the catalytic oxidation of bulky molecules. Despite progress in designing and application of titanosilicate zeolites in catalysis, only qualitative information of their acidity is available. Herein, we report thorough characterization of acid sites in TS-1 zeolites of differen...
Source: Catalysis Today - October 16, 2019 Category: Chemistry Source Type: research

Editorial
Publication date: Available online 14 October 2019Source: Catalysis TodayAuthor(s): Jun Huang (Source: Catalysis Today)
Source: Catalysis Today - October 16, 2019 Category: Chemistry Source Type: research

The elastic behavior of zeolitic frameworks: the case of MFI type zeolite under high-pressure methanol intrusion
Publication date: Available online 13 October 2019Source: Catalysis TodayAuthor(s): Davide Comboni, Francesco Pagliaro, Paolo Lotti, G. Diego Gatta, Marco Merlini, Sula Milani, Massimo Migliori, Girolamo Giordano, Enrico Catizzone, Ines E. Collings, Michael HanflandAbstractThe high-pressure behavior of six synthetic zeolites with the MFI topology, characterized by different chemical composition (framework-Si partially replaced by Al or B and counterbalanced by Na or H as extra-framework cations), has been investigated by in-situ powder synchrotron X-ray diffraction using silicone-oil and methanol as hydrostatic pressure-tr...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Zeolites in pechmann condensation: Impact of the framework topology and type of acid sites
Publication date: Available online 13 October 2019Source: Catalysis TodayAuthor(s): Ondřej Veselý, Mariya Shamzhy, Michal Mazur, Pavla EliášováAbstractIn this contribution, zeolites with different pore sizes and connectivity (MFI 10-10-10R, MTW 12R, Beta 12-12-12R) were prepared in bulk and hierarchical “nanosponge” form and with different composition (aluminosilicate, gallosilicate). Properties of the samples were characterized by X-ray diffraction, argon adsorption, transmission electron microscopy and adsorption of pyridine followed by FTIR spectroscopy. Catalytic performance (co...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Degradation of rhodamine B under visible-light with nanotubular Ag@AgCl@AgI photocatalysts
Publication date: Available online 13 October 2019Source: Catalysis TodayAuthor(s): Jun-Qi Xiao, Ndumiso Vukile Mdlovu, Kuen-Song Lin, Zong-Wei ChenAbstractIn the current study, heterostructured Ag@AgCl@AgI nanotubes were synthesized via an anion-exchange reaction between Ag@AgCl nanotubes and I− anions. Moreover, their photocatalytic performance towards the decontamination of dye contaminants were examined. These prepared photocatalysts were accordingly characterized using high-resolution scanning electron microscopy (HR-SEM), XRPD, XPS, field-emission transmission electron microscopy (FE-TEM), and photoluminescence...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Oxidative degradation of cresol isomers using ozone in the presence of SiO2-supported nickel, iron, manganese and vanadium catalysts
We report the catalytic ozonation as a viable tool in the oxidative degradation of cresol isomers. SiO2-supported metal catalysts with 2.5 and 7.5 wt.% (Ni, Fe, Mn, V) were employed in this ozone initiated oxidation reactions. All catalysts were characterized using various analytical techniques such as XRD, FT-IR, SEM-EDX, TEM, ICP-OES, and BET-surface area analyses. XRD studies revealed the existence of Fe as Fe2O3 and Mn as Mn3O4 on the supports’ surface. EDX results displayed a dispersion homogeneity of the metals over the surface of SiO2 support, and the ICP-OES analysis confirm the concentration of a load...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Development of Fixed Bed Reactor for Application in GTL-FPSO: The Effect of Nitogen and Carbon dioxide Contents in Feed Gas on Fischer-Tropsch Synthesis Reaction over Ru/Co/Al2O3 Catalyst`
Publication date: Available online 14 October 2019Source: Catalysis TodayAuthor(s): Gi Hoon Hong, Dong Ju MoonAbstractThe FTS reactions over Ru/Co/Al2O3 catalyst were performed in the shell and tube type fixed-bed reactor with an oil circulation system in order to investigate the effect of N2 and CO2 content. It was found that the N2 gas does not affect the product selectivity of the FTS reaction over Ru/Co/Al2O3 catalyst in the fixed-bed reactor at pilot scale but it has decreased the CO conversion. It was also found that the CO2 has affected the product selectivity of the FTS reaction through the chain growth reaction. I...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Efficient simultaneous esterification/transesterification of non-edible Jatropha oil for biodiesel fuel production by template-free synthesized nanoporous titanosilicates
In this study, a template-free synthesis was developed to prepare nanoporous titanosilicate materials as cost-effective, highly active and reusable solid acid catalysts to convert non-edible Jatropha oil into high-quality BDF. The synthesis involved the cocondensation of sodium silicate and triethanolamine-stabilized titanium species induced by a rapid drop of solution pH. The prepared materials exhibited high nanoporosity and adequate Lewis acidity and could effectively catalyze the simultaneous esterification/transesterification of Jatropha oil while showing extremely low leaching of silicon. The catalytic activity remai...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Three-dimensional mesoporous Ir–Ru binary oxides with improved activity and stability for water electrolysis
Publication date: Available online 13 October 2019Source: Catalysis TodayAuthor(s): Seung Woo Lee, Chaekyung Baik, Tae-Yang Kim, Chanho PakAbstractWater electrolysis (WE) involves both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). Because the kinetics of the OER are much slower than those of the HER, the overall efficiency of electrolysis is decreased. Furthermore, since the OER occurs in extremely harsh environments, stability of materials needs to be considered for WE application. To overcome this challenge, researchers have conducted many studies to investigate OER catalysts. In the curr...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: 1 January 2020Source: Catalysis Today, Volume 339Author(s): (Source: Catalysis Today)
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

CH4 dissociation and CC coupling on Mo-terminated MoC surfaces: A DFT study
Publication date: 1 January 2020Source: Catalysis Today, Volume 339Author(s): Tianyu Zhang, Xiaofeng Yang, Qingfeng GeAbstractSynthesizing high-value chemicals through CC coupling of the intermediates from CH4 dissociation is considered as the most promising pathway for efficient utilization of methane as a C1 resource. Herein, the elementary steps of CH4 dissociation and a possible mechanism for forming C2 species on the Mo-terminated MoC surfaces were studied using density functional theory (DFT) calculations. Our results indicate that the Mo-terminated MoC surfaces derived from different bulk phases (α- and &delta...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

A La-promoted Ni/MgAl2O4 catalyst with superior methanation performance for the production of synthetic natural gas
Publication date: 1 January 2020Source: Catalysis Today, Volume 339Author(s): Qiankun Liu, Jinwei Sun, Qinghua Feng, Shengfu Ji, Zhou-jun WangAbstractProduction of synthetic natural gas (SNG) has received increasing attention due to the clean nature and unbalanced reserve of natural gas. One of the technical bottlenecks for SNG production is the lack of feasible catalyst for CO methanation process. Herein, Mg-Al mixed oxides were prepared as supports by the co-precipitation method and La promoter was subsequently introduced by the co-impregnation method for Ni-based methanation catalysts. The initial activity of the Ni/Mg-...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Highly Active Monolith Catalysts of LaKCoO3 Perovskite-type Complex Oxide on Alumina-washcoated Diesel Particulate Filter and the Catalytic Performances for the Combustion of Soot
Publication date: 1 January 2020Source: Catalysis Today, Volume 339Author(s): Long Tang, Zhen Zhao, Kaixiang Li, Xuehua Yu, Yuechang Wei, Jian Liu, Yang Peng, Yazhao Li, Yongsheng ChenAbstractThe LaKCoO3/ɤ-Al2O3/cordierite and LaCoO3/ɤ-Al2O3/cordierite monolithic catalysts were successfully prepared by impregnating the as-pretreated monolith with aqueous solution of metal salts on monolithic cordierite substrate with a dip-coating two-step method. For comparison, one-step method without the alumina sol coating was also investigated. The monolithic catalysts were characterized by means of XRD, FT-IR, BET, ICP, TG–DS...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

High-performance nano-structured Ni based catalysts for high-temperature CO2CH4 reforming—Greenhouse gases to syngas
In this study, nano-structured Ni-based catalysts supported on spinel (MgAl2O4) for CO2−CH4 reforming were synthesized and evaluated under 750–900 °C, it performed with extremely high catalytic reactivity that the conversions of CO2 and CH4 were 90% and 97% at 900 °C, with gas hourly space velocity (GHSV) as high as 912,000 ml gCat−1 h−1, which is 76 times higher than the GHSV reported in other literatures. Also, the nano-structured Ni based catalysts showed excellent durability with nearly zero deactivation in 10 h. Interestingly, the Ni-based catalysts did not need initial H2 r...
Source: Catalysis Today - October 14, 2019 Category: Chemistry Source Type: research

Highly Active Hybrid Mesoporous Silica-Supported Base Organocatalysts for C-C Bond Formation
Publication date: Available online 8 October 2019Source: Catalysis TodayAuthor(s): A. Erigoni, M.C. Hernández-Soto, F. Rey, C. Segarra, U. DíazAbstractNew base hybrid catalysts, based on silyl-derivatives of molecules carrying amino, diamino, pyrrolidine, pyrazolium and imidazolium functionalities have been successfully achieved through post synthetic grafting onto M41S-type support. Different characterization techniques were implemented to study the characteristics of the materials, such as elemental analysis, solid state MAS NMR and FTIR spectroscopies, X-ray diffraction (XRD), thermogravimetric and differe...
Source: Catalysis Today - October 10, 2019 Category: Chemistry Source Type: research

ACID REMOVAL FROM CRUDE OILS BY CATALYTIC ESTERIFICATION NAPHTHENIC ACID CATALIZE BY Mg/Al HYDROTALCITE
Publication date: Available online 6 October 2019Source: Catalysis TodayAuthor(s): Nicolás Redondo, Maria L. Dieuzeide, Norma AmadeoAbstractThe presence of relatively high levels of naphthenic acids in crude oil may cause serious corrosion problem at temperature between 200 °C and 400 °C. One of the viable processes for decreasing acidity is the esterification of the present acids using an alcohol such as methanol. Therefore, the aim of this work is to develop a solid catalyst for the esterification reaction of 3-cyclopentylpropionic acid representative of the naphthenic acids.The esterificatio...
Source: Catalysis Today - October 8, 2019 Category: Chemistry Source Type: research

An Introduction and Review of Bukur’s Reaction Engineering & Catalysis Special
Publication date: Available online 3 October 2019Source: Catalysis TodayAuthor(s): Nimir O. Elbashir, Anjaneyulu Chatla, Angeliki Lemonidou, James J. SpiveyAbstractOn December 4-5, 2017, Texas A&M University at Qatar organized a symposium to celebrate and honor the distinguished contribution of Professor Dragomir Bukur in the field of reaction engineering and catalysis. Bukur Reaction Engineering & Catalysis Symposium had been funded by the Qatar National Research Fund, SASOL Qatar, and Texas A&M University at Qatar. It hosted a large number of distinguished scientists and scholars shared their research outcome...
Source: Catalysis Today - October 5, 2019 Category: Chemistry Source Type: research

Preface
Publication date: Available online 3 October 2019Source: Catalysis TodayAuthor(s): Anjali Pal, Nishith Verma (Source: Catalysis Today)
Source: Catalysis Today - October 5, 2019 Category: Chemistry Source Type: research

Preface
Publication date: Available online 4 October 2019Source: Catalysis TodayAuthor(s): Manuel Ramos, José Manuel Domínguez, Jorge Ramírez Solís, Xiaodong Wen (Source: Catalysis Today)
Source: Catalysis Today - October 5, 2019 Category: Chemistry Source Type: research

Bimetallic NiFe alloys as highly efficient electrocatalysts for the oxygen evolution reaction
In this study, binary NiFe alloy nanoparticles are successfully prepared using a simple hydrothermal method followed by H2 reduction. The nanoparticles are then applied as electrocatalysts for oxygen evolution reaction (OER). Compared to unary Ni or Fe, the binary NiFe alloy electrocatalyst exhibits a much lower overpotential of 298 mV at a current density of 10 mA cm−2, and it exhibits electrocatalytic activity for OER superior to that of state-of-the-art RuO2 and IrO2 noble metal oxide catalysts. Moreover, the alloy catalyst exhibits substantial long-term durability after 1000 cyclic voltammetry tests. This r...
Source: Catalysis Today - October 4, 2019 Category: Chemistry Source Type: research

Inverse CeO2/CuO WGS catalysts: influence of the presence of oxygen in the reactant mixture
Publication date: Available online 2 October 2019Source: Catalysis TodayAuthor(s): A. López Cámara, V. Cortés Corberán, A. Martínez-AriasAbstractThree catalysts based on inverse configuration of copper-ceria catalysts, i.e. CeO2/CuO and two others in which the copper oxide phase is doped with Mn and Zn, respectively, are examined with respect to their performance for the water-gas shift reaction (WGS) and the influence of oxygen and/or hydrogen presence in the reaction mixture. Multitechnique characterization of the catalysts evidence the inverse configuration of the catalysts prepared by...
Source: Catalysis Today - October 4, 2019 Category: Chemistry Source Type: research

Spinel oxides as coke-resistant supports for NiO-based oxygen carriers in chemical looping combustion of methane
Publication date: Available online 10 September 2019Source: Catalysis TodayAuthor(s): Amit Mishra, Ryan Dudek, Anne Gaffney, Dong Ding, Fanxing LiAbstractDue to their high activity for methane conversion under a cyclic redox scheme, supported nickel oxides are among the most extensively investigated oxygen carrier materials for chemical looping combustion (CLC) and reforming (CLR) of methane. However, coke formation remains as a key challenge for Ni-containing oxygen carriers. The current study investigates the effect of reducible, spinel-structured supports to enhance coke resistance of NiO-based oxygen carriers. It was h...
Source: Catalysis Today - October 3, 2019 Category: Chemistry Source Type: research

Systematic computational investigation of an Ni3Fe catalyst for the OER
Publication date: Available online 29 September 2019Source: Catalysis TodayAuthor(s): Pengbo Lyu, Petr NachtigallAbstractNon-precious transition metals encapsulated in nitrogen-doped carbon nanotubes or between graphene layers are promising electrocatalysts for the oxygen evolution reaction (OER), which is part of a green hydrogen production process. Recently, FeNi3 nanoparticles encapsulated by one layer of nitrogen-doped carbon (NC) denoted FeNi3@NC were experimentally reported to be highly active. However, the electrocatalytic performance of such system has not been optimized and the influences of factors such as the th...
Source: Catalysis Today - September 30, 2019 Category: Chemistry Source Type: research

Tandem dual bed Mo/HZSM-5 and Mo/HMCM-22 catalysts with enhanced catalytic performance for natural gas conversion to aromatics
Publication date: Available online 28 September 2019Source: Catalysis TodayAuthor(s): Yan Liu, Fethi Kooli, Armando BorgnaAbstractNatural gas / methane conversion to aromatics and hydrogen through non-oxidative dehydroaromatization reaction is an attractive way for C1 utilization. In this contribution, the thermal stability of high (12 wt%) and low (5 wt%) Mo loading catalysts on HZSM-5 and HMCM-22 zeolites was studied under different pretreatment conditions. It was found that using reductive pretreatment, especially pretreated with CH4 + H2 mixtures, Mo catalysts exhibited high thermal stability with well-ke...
Source: Catalysis Today - September 30, 2019 Category: Chemistry Source Type: research

The structure-catalytic activity relationship for the transient layered zeolite MCM-56 with MWW topology
Publication date: Available online 28 September 2019Source: Catalysis TodayAuthor(s): Aleksandra Korzeniowska, Justyna Grzybek, Katarzyna Kałahurska, Martin Kubu, Wiesław J. Roth, Barbara GilAbstractZeolite MCM-56 is a high alumina, monolayered form of the commercially useful framework MWW but it is a transient product during crystallization, so many factors influence its state and quality. This work examines properties of a series of MCM-56 and MCM-49 samples synthesized for different times using Aerosil, Ultrasil and Ludox as silica sources, hexamethyleneimine as the structure directing agent and additionally aniline a...
Source: Catalysis Today - September 30, 2019 Category: Chemistry Source Type: research

Crystal Refinement of Rutile by Sonochemical Method to Achieve High Performance Pd Catalysts for Direct Synthesis of Hydrogen Peroxide
In this study, sonochemically prepared (S) Pd catalysts supported on anatase (Ana) and rutile (Rut) were compared to incipient wetness impregnated (I) Pd catalysts for the direct synthesis of hydrogen peroxide. Pd/Ana-S and Pd/Rut-S achieved higher H2 conversion than Pd/Ana-I and Pd/Rut-I due to the improvement of metal dispersion by the sonochemical method. Especially, Pd dispersion on Pd/Rut-S was estimated to be six times higher than other catalysts, resulting in the highest H2O2 production rate. Through multiple characterizations (TEM, N2 adsorption-desorption, H2-TPR and CO-chemisorption), we discovered that many part...
Source: Catalysis Today - September 30, 2019 Category: Chemistry Source Type: research

CO and CO2 methanation over M (MMn, Ce, Zr, Mg, K, Zn, or V)-promoted Ni/Al@Al2O3 catalysts
Publication date: Available online 31 August 2019Source: Catalysis TodayAuthor(s): Thien An Le, Jieun Kim, Jong Kyu Kang, Eun Duck ParkAbstractEffects of metal promoter on CO and CO2 methanation were examined over Ni-M (M = Mn, Ce, Zr, Mg, K, Zn, or V)/Al@Al2O3 catalysts prepared by the co-impregnation method. Ni-M (M = Mn, Ce, or Zr)/γ-Al2O3 catalysts were also investigated for comparison. The prepared catalysts were characterized with a variety of techniques such as N2 physisorption, CO2 chemisorption, H2 chemisorption, temperature-programmed reduction with H2 (H2-TPR), temperature-programmed desorption of ...
Source: Catalysis Today - September 28, 2019 Category: Chemistry Source Type: research

Selective adsorption of toluene and n-hexane binary mixture from aqueous solution on zeolite ZSM-5: evaluation of competitive behavior between aliphatic and aromatic compounds
In this study, high silica ZSM-5 was selected as an adsorbent for the removal of toluene (TOL) and n-hexane (HEX) binary mixtures from aqueous solution over a wide range of concentrations. In comparison with the single component systems, the binary mixture induced to a selective adsorption by the ZSM-5 zeolite. As a matter of fact, a selective adsorption, described by a competitive dual site Langmuir adsorption isotherm, is revealed where alkane compound is preferred to the aromatic one. Results from adsorption isotherm were related to the structural answer of the ZSM-5 framework as a function of a HEX-TOL equimolar binary...
Source: Catalysis Today - September 28, 2019 Category: Chemistry Source Type: research

Bimetallic FeNi Alloys as Highly Efficient Electrocatalysts for the Oxygen Evolution Reaction
In this study, binary NiFe alloy nanoparticles are successfully prepared using a simple hydrothermal method followed by H2 reduction. The nanoparticles are then applied as electrocatalysts for oxygen evolution reaction (OER). Compared to unary Ni or Fe, the binary NiFe alloy electrocatalyst exhibits a much lower overpotential of 298 mV at a current density of 10 mA cm−2, and it exhibits electrocatalytic activity for OER superior to that of state-of-the-art RuO2 and IrO2 noble metal oxide catalysts. Moreover, the alloy catalyst exhibits substantial long-term durability after 1000 cyclic voltammetry tests...
Source: Catalysis Today - September 28, 2019 Category: Chemistry Source Type: research

High activity of Ga-containing nanosponge MTW zeolites in acylation of p-xylene
Publication date: Available online 27 September 2019Source: Catalysis TodayAuthor(s): Jin Zhang, Ondřej Veselý, Mariya V. Shamzhy, Maksym Opanasenko, Jiři ČejkaAbstractAluminosilicate and gallosilicate MTW zeolites were prepared in the bulk and nanosponge form by direct hydrothermal synthesis. Designed materials were tested in acylation of p-xylene with benzoyl chloride and compared with large pore zeolite *BEA and medium pore zeolite MFI. Nanosponge MTW exhibited generally better performance than bulk MTW zeolites due to higher accessibility of the catalyst´s active sites in nanosponge zeolite. Selective t...
Source: Catalysis Today - September 28, 2019 Category: Chemistry Source Type: research

Selective production of Dihydroxyacetone and Glyceraldehyde by Photo-assisted Oxidation of Glycerol
Publication date: Available online 27 September 2019Source: Catalysis TodayAuthor(s): Arisbeht Mendoza, Rubí Romero, Galilea P. Gutiérrez-Cedillo, Gustavo López-Tellez, Omar Lorenzo-González, Rosa María Gómez-Espinosa, Reyna NatividadAbstractGlycerol is a by-product during biodiesel production and represents a potential low-cost raw material for obtaining high-cost products like Dihydroxyacetone (DHA) and glyceraldehyde (GCD) amongst others. In this work, Fe-Pillared clay (Fe-PILC) was assessed as catalyst of the selective photo-oxidation of glycerol to obtain DHA and GCD at modera...
Source: Catalysis Today - September 28, 2019 Category: Chemistry Source Type: research

Direct α-arylation of ketones efficiently catalyzed by Cu-MOF-74
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): P. Leo, G. Orcajo, D. Briones, F. Martínez, G. CallejaAbstractThe activity and reusability of Cu-MOF-74 as heterogeneous catalyst were studied in the Cu-catalyzed CC cross-coupling reaction of 4-iodotoluene (4-IT) with acetylacetone (AcAc) to direct synthesis of α-aryl-ketones. Cu-MOF-74 is characterized by having unsaturated copper sites into its highly porous metal-organic framework that can play a crucial role in catalytic applications. The influence of critical reaction variables such as solvent, reaction temperature, AcA...
Source: Catalysis Today - September 27, 2019 Category: Chemistry Source Type: research

ECO-FRIENDLY CYCLOHEXANE OXIDATION BY A v-SCORPIONATE complex IMMOBILIZED AT HIERARCHICAL mor ZEOLITE
Publication date: Available online 26 September 2019Source: Catalysis TodayAuthor(s): Davide Ottaviani, Vanmira Van-Dúnem, Ana P. Carvalho, Angela Martins, Luísa M.D.R.S. MartinsAbstractThe hydrotris(3,5-dimethylpyrazol-1-yl)borate dioxido-vanadium(V) complex [VO2{HB(3,5-Me2pz)3}] (V, pz = pyrazol-1-yl) immobilized at hierarchical MOR zeolite modified through surfactant mediated technology using NaOH as alkaline agent, V@MOR_NaOH, provides an efficient (TON up to 5.2 × 102) catalyst for the peroxidative oxidation of cyclohexane with tert-butyl hydroperoxide to KA oil (52% yie...
Source: Catalysis Today - September 27, 2019 Category: Chemistry Source Type: research

Aqueous phase reforming of the residual waters derived from lignin-rich hydrothermal liquefaction: investigation of representative organic compounds and actual biorefinery streams
Publication date: Available online 26 September 2019Source: Catalysis TodayAuthor(s): Giuseppe Pipitone, Giulia Zoppi, Sergio Bocchini, Andrea Maria Rizzo, David Chiaramonti, Raffaele Pirone, Samir BensaidAbstractSecondary streams in biorefineries need to be valorized to improve the economic and environmental sustainability of the plants. Representative model compounds of the water fraction from the hydrothermal liquefaction (HTL) of biomass were subjected to aqueous phase reforming (APR) to produce hydrogen. Carboxylic and bicarboxylic acids, hydroxyacids, alcohols, cycloketones and aromatics were identified as model comp...
Source: Catalysis Today - September 27, 2019 Category: Chemistry Source Type: research

Morphology Change and Phase Transformation of Alumina Related to Defect Sites and Its Use in Catalyst Preparation
Publication date: Available online 26 September 2019Source: Catalysis TodayAuthor(s): Eun Jeong Jang, Jaekyoung Lee, Ja Hun KwaAbstractThe surface properties of support have a large influence on the catalyst properties and the catalyst properties are usually interpreted based on the characterization results of the support surface. However, in many cases, especially when γ-Al2O3 is used as the support, the alumina surface can change during catalyst preparation. Here, the significant changes in the physical and chemical properties of γ-Al2O3 were observed during catalyst preparation by using incipient wetness imp...
Source: Catalysis Today - September 27, 2019 Category: Chemistry Source Type: research

Identifying Cu-oxo species in Cu-zeolites by XAS: a theoretical survey by DFT-assisted XANES simulation and EXAFS wavelet transform
We present a combined DFT-assisted analysis based on both full-potential XANES simulation and Wavelet Transform Analysis (WTA) applied to computed EXAFS signals. The resulting theoretical insights set the bases for an easier and more robust interpretation of the XAS data collected on Cu-zeolite systems. In particular, we evidenced possible fingerprint features in the XANES region, together with the difficulties in discriminating among monomeric and dimeric CuII moieties solely based on their XANES signatures. We then show the potential of Wavelet Transform Analysis as a new tool in the identification and visualization of E...
Source: Catalysis Today - September 27, 2019 Category: Chemistry Source Type: research

CO and CO2 methanation over Ni/Al@Al2O3 core–shell catalyst
Publication date: Available online 25 September 2019Source: Catalysis TodayAuthor(s): Thien An Le, Jieun Kim, Jong Kyu Kang, Eun Duck ParkAbstractCore–shell Al@Al2O3, which was obtained by hydrothermal surface oxidation of Al metal particles, was used as the support in supported Ni catalysts for CO and CO2 methanation. The core–shell micro-structured support (Al@Al2O3) helped develop a highly efficient Ni-based catalyst compared with conventional γ-Al2O3 for these reactions. Moreover, the deposition–precipitation method was shown to outperform the wet impregnation method in the preparation of the ac...
Source: Catalysis Today - September 26, 2019 Category: Chemistry Source Type: research

Direct synthesis of H2O2 over acid-treated Pd/C catalyst derived from a Pd-Co core-shell structure
In this study, we propose a novel catalyst design involving the formation of Pd@Co(BO3)2 core-shell nanoparticles (NPs) on an activated carbon support followed by the cobalt borate shell etching with H3PO4. The non-noble metal shell efficiently suppressed unfavorable aggregation of Pd NPs, resulting in the formation of small and monodisperse Pd NPs after stripping the cobalt. The use of H3PO4 was also beneficial to obtain a high H2O2 yield by decreasing the metallic nature of Pd and enabling the acid-treated activated carbon to act as a solid acid support. The features of the acid-treated Pd/C catalyst derived from the Pd@...
Source: Catalysis Today - September 26, 2019 Category: Chemistry Source Type: research

Density functional theory study on the dehydrogenation of 1,2-dimethyl cyclohexane and 2-methyl piperidine on Pd and Pt catalysts
Publication date: Available online 24 September 2019Source: Catalysis TodayAuthor(s): Hyunwoo Yook, Kyeounghak Kim, Ji Hoon Park, Young-Woong Suh, Jeong Woo HanAbstractLiquid organic hydrogen carrier (LOHC) is one of the advantageous hydrogen storage technologies, which store hydrogen through a chemical bond in liquid organic compounds. We previously developed a promising LOHC material, 2-[N-methylbenzyl]pyridine (MBP). However, the mechanism and catalytic behavior for the dehydrogenation of dodecahydro-MBP (H12-MBP) on the catalysts are not still clear. For the fundamental understanding of H12-MBP dehydrogenation, we focu...
Source: Catalysis Today - September 26, 2019 Category: Chemistry Source Type: research

The new Fischer-Tropsch process over ultrafine catalysts
Publication date: Available online 24 September 2019Source: Catalysis TodayAuthor(s): Mayya V. KulikovaAbstractTIPS RAS (Russia) has developed a new technology for high temperature three-phase Fischer-Tropsch synthesis. This technology is based on an original nanosized iron catalyst and a new reactor type. Producing light liquid hydrocarbons enriched with α-olefins (up to 50% wt) is the main distinction from industrial slurry-technologies. Yield of these products is about 140 gram per 1 cubic meter of syngas. This technology is tested in a pilot plant with capacity of up to 2 liters of liquid hydrocarbo...
Source: Catalysis Today - September 26, 2019 Category: Chemistry Source Type: research

Enhancement of Biodiesel Production via Sequential Esterification/Transesterification over Solid Superacidic and Superbasic Catalysts
Publication date: Available online 24 September 2019Source: Catalysis TodayAuthor(s): Chao-Lung Chiang, Kuen-Song Lin, Chia-Wei Shu, Jeffrey Chi-Sheng Wu, Kevin Chia-Wen Wu, Yu-Tzu HuangAbstractRecently, biodiesel can be produced from energy crops and has been recognized as an ideal candidate for satisfying the global energy demand. Owing to its fossil-fuel-similar physicochemical properties, biodiesel is also regarded as an alternative fuel for various applications. In the present work, soybean oil with added fatty free acid (FFA; palmitic acid, 5.0 wt%) was converted to biodiesel adopting a two-step process in a c...
Source: Catalysis Today - September 26, 2019 Category: Chemistry Source Type: research

Preface
Publication date: Available online 23 September 2019Source: Catalysis TodayAuthor(s): Eric van Steen, J.W. Niemantsverdriet, Graham J. Hutchings, Michael Claeys, Nico Fischer (Source: Catalysis Today)
Source: Catalysis Today - September 23, 2019 Category: Chemistry Source Type: research

Characteristics of Si-Y Mixed Oxide Supported Nickel Catalysts for the Reductive Amination of Ethanol to Ethylamines
Publication date: Available online 20 September 2019Source: Catalysis TodayAuthor(s): Ye-Seul Jeong, Yesol Woo, Myung-June Park, Chae-Ho ShinAbstractSi-Y mixed oxide synthesis was achieved via Si dissolution from a Pyrex reactor during the synthesis of yttrium hydroxide by the precipitation method at pH 10 and an aging temperature of 100 ℃. The Ni/SY mixed oxide catalysts with 5–25 wt% Ni contents were synthesized using an incipient wetness impregnation method. The characterization of the calcined Ni/SY oxide catalysts was performed using N2-sorption, X-ray diffraction, H2-temperature programmed reduction (T...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Radially ordered carbon nanotubes performance for li-o2 batteries: Pre-treatment influence on capacity and discharge products
We report a novel electrode for Li-O2 battery based on radially ordered multi-walled carbon nanotubes functionalized by acid and plasma pre-treatments without degrading its structure with improved wettability leading to more effective active sites. This electrode was used in a device with DMSO/LiClO4 as the electrolyte, presenting good discharge capacity result (2804 mA h g-1C). The defects on the nanotube structure were characterized with RAMAN and a correlation from defects and discharge capacity was observed indicating that the defects could provide larger number of effective regions for discharge products...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Small ZSM-5 crystals with low defect density as an effective catalyst for conversion of methanol to hydrocarbons
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): Mattias Grahn, Abrar Faisal, Olov G.W. Öhrman, Ming Zhou, Matteo Signorile, Valentina Crocellà, Mohammad Sadegh Nabavi, Jonas HedlundAbstractThis work presents the synthesis of nearly defect-free ZSM-5 nanosized crystals, prepared in fluoride medium by seeding with silicalite-1. This material was carefully characterized and its catalytic performances in the methanol to hydrocarbons (MTH) reaction were assessed. Such fluoride-based material was compared to a reference ZSM-5, produced through a conventional alkaline synthesis bu...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Solvent free epoxidation of vernonia oil using Ti-SBA-15 with tailor made particle morphology and pore size
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): Yaregal Awoke, Yonas Chebude, Carlos Márquez-Álvarez, Isabel DíazAbstractVernonia galamensis is a native weed of Ethiopia containing high concentration of naturally epoxidized oil (glyceryl trivernolate) in its seeds, which could be used as a potential substitute for currently used epoxy oils. Apart from an epoxy group, vernolic acid contains a double bond that could be further epoxidized yielding a low viscosity, high oxirane, non-edible oil. Epoxidized vegetable oils are usually produced at industrial scale mainly b...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Direct α-arylation of ketones eeficiently catalyzed by Cu-MOF-74
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): P. Leo, G. Orcajo, D. Briones, F. Martínez, G. CallejaAbstractThe activity and reusability of Cu-MOF-74 as heterogeneous catalyst were studied in the Cu-catalyzed C-C cross-coupling reaction of 4-iodotoluene (4-IT) with acetylacetone (AcAc) to direct synthesis of α-aryl-ketones. Cu-MOF-74 is characterized by having unsaturated copper sites into its highly porous metal-organic framework that can play a crucial role in catalytic applications. The influence of critical reaction variables such as solvent, reaction temperature, Ac...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Graphene hybridized high energy faceted titanium dioxide for transparent self-cleaning coatings
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): Nisha T. Padmanabhan, Madambi K. Jayaraj, Honey JohnAbstractA transparent superhydrophilic self-cleaning nanocoating is fabricated and developed by hybridizing anatase TiO2 with graphene sheets. In the hybrid preparation, ellipsoidal TiO2 nanocrystals are grown exclusively over the graphene sheets, exposing high energy {001} and {010}/{100} facets. The hybrid is synthesized by a hydrothermally modified sol-gel method using CTAB (Cetyltrimethylammonium bromide) as the capping agent under an acidic of pH 3 and using very low weight percenta...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Some history on the new ways of synthesis of nitriles
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): Ferruccio TrifiròAbstractIn this note discuss the papers I wrote together with Robert Grasselli in the field of ammoxidation. Together, we have investigated the ammoxidation of propylene, essentially on the role of Te as promoter, the ammoxidation of propane to acrylonitrile, the ammoxidation of alkyl aromatics to nitriles and we have analyzed from data in the literature the possibility to produce acrylonitrile from biomass. In the field of ammoxidation of propane we have investigated catalysts based on Sb/V/Al mixed oxides with so...
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research

Advanced Photoactive Materials for Environmental and Energy Applications
Publication date: Available online 19 September 2019Source: Catalysis TodayAuthor(s): Vicente Rodríguez-González, Agileo Hernandez-Gordillo, Yun Hang Hu (Source: Catalysis Today)
Source: Catalysis Today - September 21, 2019 Category: Chemistry Source Type: research