Cu/Fe3O4 catalyst for water gas shift reaction: Insight into the effect of Fe2+ and Fe3+ distribution in Fe3O4 |
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| Affiliation: | 1. School of Materials Science and Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China;2. Key Laboratory of Processing and Quality Evaluation Technology of Green Plastics of China National Light Industry Council, Beijing Technology and Business University, Beijing, 100048, China;3. School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Luoshi Road 122, Wuhan, 430070, China;4. Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062, China;1. Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, Jiangsu Province 213164, China;2. Key Laboratory of Ministry of Education for Soft Chemistry and Functional Materials, Nanjing University of Science and Technology, Nanjing 210094, China;1. Department of Chemistry, Capital Normal University, Beijing, 100048, China;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China |
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| Abstract: | Two precursors, namely, p-CFO-T (tetragonal) and p-CFO-C (cubic), were fabricated by a sol-gel method via citric acid and poly(vinyl alcohol) complexation, respectively. After H2-reduction, the two were converted to Cu/Fe3O4 catalysts of different complexions, which are named as CFO-CA and CFO-PVA, respectively. The distribution of Fe2+ and Fe3+ in the Cu/Fe3O4 catalysts was studied by Raman and XPS techniques. It was disclosed that the distribution of Fe2+ and Fe3+ in Fe3O4 has an effect on Cu–Fe3O4 interaction and catalyst surface basicity. Compared to CFO-PVA, CFO-CA has a larger amount of Fe3+, which mostly sits at the octahedral sites, leading to stronger Cu–Fe3O4 interaction, and a larger amount of catalyst surface sites that are of weak basicity. As a result, the critical elementary steps of WGS reaction, viz. water dissociation, –COOH decomposition and CO2 desorption are promoted as reflected in the lower Ea and higher catalytic activity of CFO-CA. |
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| Keywords: | Water gas shift Copper ferrite Cation distribution |
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