Hydrogen purification over lanthanum-doped iron oxides by WGSR

Publication date: 1 November 2017 Source:Catalysis Today, Volume 296 Author(s): Maria do Carmo Rangel, Peterson Santos Querino, Sarah Maria Santana Borges, Sergio Gustavo Marchetti, José Mansur Assaf, Doris Polett Ruiz Vásquez, Cristiane Barbieri Rodella, Tatiana de Freitas Silva, Alisson Henrique Marques da Silva, Adriana Paula Ramon Hydrogen technology has been greatly increased in last decades as a promising solution to protect the environment. When carbon-based feedstocks are used, such as natural gas, biomass and biogas, the water gas shift reaction (WGSR) plays an important step in the production of high pure hydrogen for several purposes. By this reaction, the residual carbon monoxide in the gaseous stream (coming from steam reforming of carbon-based feedstocks) can be converted to carbon dioxide and then removed from the stream, avoiding the poisoning of industrial metallic catalysts as well as of electrocatalysts in fuel cells. Aiming to obtain no toxic catalysts that can replace the commercial chromium-doped hematite catalysts, lanthanum-doped hematite was studied in this work. Iron oxide-based samples with different amounts of lanthanum (La/Fe (molar)=0.02; 0.08 and 0.2) were obtained by sol-gel method and calcined at 600°C. The catalysts were characterized by X-ray diffraction, specific surface area measurements, temperature programmed reduction, Raman spectroscopy, Mössbauer spectroscopy, transmission electron microscopy and X-ray photoelectron sp...
Source: Catalysis Today - Category: Chemistry Source Type: research