Strong Metal–Support Interactions between Copper and Iron Oxide during the High‐Temperature Water‐Gas Shift Reaction
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- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China
- Operando Molecular Spectroscopy &, Catalysis Laboratory Department of Chemical and Biomolecular Engineering Lehigh University Bethlehem PA 18015 USA
- Department of Inorganic Chemistry Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Germany
- State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China, Research Center of Heterogeneous Catalysis and Engineering Sciences School of Chemical Engineering and Energy Zhengzhou University Zhengzhou 450001 China
Abstract The commercial high‐temperature water‐gas shift (HT‐WGS) catalyst consists of CuO‐Cr 2 O 3 ‐Fe 2 O 3 , where Cu functions as a chemical promoter to increase the catalytic activity, but its promotion mechanism is poorly understood. In this work, a series of iron‐based model catalysts were investigated with in situ or pseudo in situ characterization, steady‐state WGS reaction, and density function theory (DFT) calculations. For the first time, a strong metal‐support interaction (SMSI) between Cu and FeO x was directly observed. During the WGS reaction, a thin FeO x overlayer migrates onto the metallic Cu particles, creating a hybrid surface structure with Cu‐FeO x interfaces. The synergistic interaction between Cu and FeO x not only stabilizes the Cu clusters, but also provides new catalytic active sites that facilitate CO adsorption, H 2 O dissociation, and WGS reaction. These new fundamental insights can potentially guide the rational design of improved iron‐based HT‐WGS catalysts.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-98CH10886; FG02-05ER15688
- OSTI ID:
- 1518524
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 27 Vol. 58; ISSN 1433-7851
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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