期刊
CATALYSIS TODAY
卷 182, 期 1, 页码 60-66出版社
ELSEVIER
DOI: 10.1016/j.cattod.2011.07.026
关键词
XANES; XRD; TPR; Copper; Cobalt; Reduction
资金
- Center for Atomic Level Catalyst Design
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001058]
- Oak Ridge National Laboratory by the Scientific User Facilities Division, U.S. Department of Energy
- Louisiana Board of Regents
Cu/SiO2, Co/SiO2, and bimetallic CuCo/SiO2 catalysts have been synthesized and their reduction behavior characterized by TPR, in situ XRD, and in situ XANES. In Cu/SiO2, a two step reduction process, CuO -> Cu2O -> Cu-0, occurred. Two forms of the intermediate Cu2O with different degrees of reducibility were observed. Addition of cobalt to Cu/SiO2 resulted in formation of an amorphous fraction of CuO that was more easily reducible than crystalline CuO. Cobalt addition also prevented formation of the less reducible form of Cu2O. Addition of copper to Co/SiO2 increased the reducibility of Co3O4, and to greater extent of the intermediate CoO, which in the monometallic Co/SiO2 was less readily reduced due to interaction with the support. (C) 2011 Elsevier B.V. All rights reserved.
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