Journal
JOURNAL OF CATALYSIS
Volume 301, Issue -, Pages 30-37Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.01.022
Keywords
CO2 conversion; Bimetallic catalysts; Oxide supports; d-Band center
Categories
Funding
- National Science Foundation [CBET-940768]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0940768] Funding Source: National Science Foundation
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The reduction of CO2 by hydrogen has been conducted on supported catalysts in a batch reactor. Catalysts synthesized on a reducible support (CeO2) showed higher activity than on an irreducible support (gamma-Al2O3). The active metal also played an important role in controlling the selective reduction of CO2 to CO instead of CH4. Extended X-ray absorption fine structure (EXAFS) and transmission electron microscopy (TEM) confirmed the formation of uniform, bimetallic particles. Among the monometallic and bimetallic catalysts evaluated in the current study, PdNi/CeO2 was the most active bimetallic catalyst, but also formed the greatest amount of CH4, while PtCo/gamma-Al2O3 showed the highest selectivity to CO with little CH4 production. The selectivity was correlated with electronic properties of the supported catalysts by using values of surface d-band center. The general trends observed should provide insights in identifying desirable catalysts for the reduction of CO2. (C) 2013 Elsevier Inc. All rights reserved.
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