Cobalt-isomorphous substituted SAPO-34 via milling and recrystallization for enhanced catalytic lifetime toward methanol-to-olefin reaction

Publication date: 25 November 2019Source: Journal of Industrial and Engineering Chemistry, Volume 79Author(s): Su-Un Lee, You-Jin Lee, Jeong-Rang Kim, Kwang-Eun Jeong, Soon-Yong JeongAbstractSilicoaluminophsophate (SAPO)-34 is considered as a promising catalyst for methanol-to-olefin (MTO) reaction, because its cylinder-like cages with small 8-ring pore openings restrict the diffusion of large hydrocarbons and exceptionally give high selectivity for light olefins. However, its main drawback is rapid catalytic deactivation by heavy hydrocarbons confined inside the cages. Here, we report a facile synthetic strategy for submicro-sized cobalt (Co)-isomorphous substituted SAPO-34 with controlled Co content through milling and Co-incorporated recrystallization. Co-isomorphous substitution on the CHA framework of SAPO-34 was thoroughly proven by XRD patterns, HADDF scanning TEM images, EDS mapping images, H2-TPR profiles, and diffuse reflectance UV-Vis spectra. Regarding the modified particle size, pore structure and acidity of the as-synthesized Co-isomorphous substituted SAPO-34, evaluation of MTO reaction revealed the correlation between the catalytic lifetime and the content of Co-isomorphous substitution. As an efficient platform to overcome the intrinsically low catalytic lifetime toward MTO reaction, this work provides a versatile strategy to generate various transition metal-isomorphous substituted SAPO-34 materials on the submicro scale.Graphical abstract
Source: Journal of Industrial and Engineering Chemistry - Category: Chemistry Source Type: research

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Publication date: Available online 15 October 2019Source: Sport Management ReviewAuthor(s): Kate Westberg, Constantino Stavros, Francis Farrelly, Aaron C.T. SmithAbstractSport has the capacity to intimately engage fans, deliver intensely emotional experiences, and create attachments to athletes and teams. This connection can be threatened by a number of actions or incidents, including scandals, and fans may engage in a range of behaviors to protect their identification. The purpose of this study is to explore and explicate the concept of fan empathy and illuminate the processes that fans engage in that lead to an empatheti...
Source: Sport Management Review - Category: Sports Medicine Source Type: research
Publication date: Available online 14 October 2019Source: Seminars in Ultrasound, CT and MRIAuthor(s): A Sureshkumar, B Hansen, D ErsahinAbstractNuclear medicine (NM) plays a unique role in the detection of infection and inflammation. This review looks at different methods that are used for detection of infections and explains how they differ from cross sectional imaging such as CT and MRI. Images are provided to aid understanding and interpretation of NM scans. There is also a brief discussion of future techniques that can alter the use of NM for infection work up.
Source: Seminars in Ultrasound, CT and MRI - Category: Radiology Source Type: research
Publication date: Available online 14 October 2019Source: NeuroImage: ClinicalAuthor(s): Robert Loughnan, Diego L. Lorca-Puls, Andrea Gajardo-Vidal, Valeria Espejo-Videla, Céline R. Gillebert, Dante Mantini, Cathy J. Price, Thomas M.H. HopeAbstractAround a third of stroke survivors suffer from acquired language disorders (aphasia), but current medicine cannot predict whether or when they might recover. Prognostic research in this area increasingly draws on datasets associating structural brain imaging data with outcome scores for ever-larger samples of stroke patients. The aim is to learn brain-behavior trends from ...
Source: NeuroImage: Clinical - Category: Radiology Source Type: research
This study aims at prospectively evaluating an adapted DWI sequence ex vivo and in vivo in oncologic patients undergoing abdominal MRI. Methods This institutional review board–approved, prospective study included phantom measurements, volunteer examinations, and oncologic patient examinations of the abdomen. Fifty-seven MRI examinations in 54 patients (mean age, 58 years; range, 21–90 years) were included into the analysis. The MRI examination were performed at a 1.5 T MRI scanner (MAGNETOM Aera; Siemens Healthcare, Erlangen, Germany) and included both a standard EPI-DWI (s-DWI; b = 50, 900 s/mm2) and an ada...
Source: Investigative Radiology - Category: Radiology Tags: Original Articles Source Type: research
Objectives The aim of this study was to compare a compressed-sensing free-breathing VIBE (fbVIBE) with a conventional breath-hold VIBE (bhVIBE) for dynamic contrast-enhanced imaging of the upper abdomen. Materials and Methods In total, 70 datasets (bhVIBE, n = 30; fbVIBE n = 40; hard-gated [hg] reconstruction, n = 30; motion-state-resolved [mr] reconstruction, n = 10) were assessed by 2 experienced readers. Both sequences were performed on 1.5-T magnetic resonance imaging scanners. The prototypical fbVIBE sequence acquired a navigation signal along with the imaging data and supported 2 different reconstructions: an hg...
Source: Investigative Radiology - Category: Radiology Tags: Original Articles Source Type: research
ConclusionsWhen applied to orthopedic stainless steel hardware in vitro, solutions of rifampin and vancomycin powder separately or in combination can completely prevent and eliminate biofilm produced by S. aureus.Level of EvidenceII;
Source: Journal of Clinical Orthopaedics and Trauma - Category: Orthopaedics Source Type: research
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Source: Journal of Minimally Invasive Gynecology - Category: OBGYN Source Type: research
Publication date: November–December 2019Source: Journal of Minimally Invasive Gynecology, Volume 26, Issue 7, SupplementAuthor(s): D Bastawros, N Hendley, J Zhao, EM Myers, GB Taylor, MJ Kennelly, KJ Stepp, ME TarrStudy ObjectiveTo evaluate the accuracy of bladder scanner measurements in assessing post-void residual (PVR) volumes in obese women [body mass index (BMI)≥30 kg/m2] as compared to non-obese women (BMI
Source: Journal of Minimally Invasive Gynecology - Category: OBGYN Source Type: research
ConclusionGU and GI fistulas are rare but morbid entities, which most often manifest after missed bladder or bowel injuries, post benign gynecological surgeries. Early detection and recognition of GI and GU injuries may be key for secondary prevention of fistula formation.
Source: Journal of Minimally Invasive Gynecology - Category: OBGYN Source Type: research
Publication date: Available online 14 October 2019Source: The LancetAuthor(s): The CRASH-3 trial collaboratorsSummaryBackgroundTranexamic acid reduces surgical bleeding and decreases mortality in patients with traumatic extracranial bleeding. Intracranial bleeding is common after traumatic brain injury (TBI) and can cause brain herniation and death. We aimed to assess the effects of tranexamic acid in patients with TBI.MethodsThis randomised, placebo-controlled trial was done in 175 hospitals in 29 countries. Adults with TBI who were within 3 h of injury, had a Glasgow Coma Scale (GCS) score of 12 or lower or any intracran...
Source: The Lancet - Category: General Medicine Source Type: research
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