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Title: A combined experimental and computational study of water-gas shift reaction over rod-shaped Ce0.75 M0.25O2 (M=Ti, Zr, and Mn) supported Cu catalysts

Journal Article · · International Journal of Hydrogen Energy
 [1];  [2];  [2];  [3];  [2]
  1. Beijing Univ. of Chemical Technology (China). State Key Lab. of Chemical Resource Engineering; Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Inst. for Integrated Catalysis
  2. Beijing Univ. of Chemical Technology (China). State Key Lab. of Chemical Resource Engineering
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Inst. for Integrated Catalysis

Water-gas shift (WGS) reaction over a series of ceria-based mixed oxides supported Cu catalysts was investigated using a combined experimental and theoretical method. The mixed rod-shaped Ce0.75M0.25O2 (M = Ti4+, Zr4+, Mn4+) solid solutions, which majorly expose the (110) and (100) facets, are synthesized by hydrothermal method and used to prepare supported Cu catalysts. We found that the Cu/Ce0.75Ti0.25O2 (Cu-CT) exhibits the highest CO conversion in the temperature range of 150-250 °C among all supported Cu catalysts. This is mainly attributed to (i) good dispersion of Cu; (ii) largest amount of moderate copper oxide; and (iii) strongest Cu-support interaction of Cu-CT. And compared to other mixed metals, periodic density functional theory calculations performed, this work further suggest that the introduction of Ti into CeO2 not only promotes oxygen vacancy formation and CO adsorption, but also facilitates the carboxyl (COOH) formation at the interface of the Cu cluster and the support, which leads to the enhanced catalytic activity of the Cu-CT toward WGS reaction.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
21476012; 21571012; 91534201; AC0576RL01830
OSTI ID:
1413488
Alternate ID(s):
OSTI ID: 1496274
Report Number(s):
PNNL-SA-129864; PII: S0360319917339459
Journal Information:
International Journal of Hydrogen Energy, Vol. 42, Issue 51; ISSN 0360-3199
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Low-Cost Catalysts for the Water Gas Shift Reaction Based on Cu-Ni on La-Promoted Ceria: Low-Cost Catalysts for the Water Gas Shift Reaction Based on Cu-Ni on La-Promoted Ceria journal June 2018