Pulse Studies to Decipher the Role of Surface Morphology in CuO/CeO.sub.2 Nanocatalysts for the Water Gas Shift Reaction

The water-gas shift reaction (WGS, CO + H.sub.2O → H.sub.2 + CO.sub.2) was studied over CuO/CeO.sub.2 catalysts with two different ceria particle morphologies, in the form of nanospheres (ns) and nanocubes (nc). To understand the strong dependence of the WGS reaction activity on the ceria nanoshapes...

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Bibliographic Details
Published in:Catalysis letters 2015-03, p.808
Main Authors: Zhao, Fuzhen, Liu, Zongyuan, Xu, Wenqian, Yao, Siyu, Si, Rui, Johnston-Peck, Aaron C, Martinez-Arias, Arturo, Hanson, Jonathan C, Senanayake, Sanjaya D, Rodriguez, Jose A
Format: Article
Language:English
Subjects:
Cerium
Cobalt
Diffraction
X-rays
Online Access:Get full text
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Summary:The water-gas shift reaction (WGS, CO + H.sub.2O → H.sub.2 + CO.sub.2) was studied over CuO/CeO.sub.2 catalysts with two different ceria particle morphologies, in the form of nanospheres (ns) and nanocubes (nc). To understand the strong dependence of the WGS reaction activity on the ceria nanoshapes, pulses of CO (without and with water vapor) were employed during in situ X-ray diffraction and X-ray absorption near edge structure measurements done to characterize the catalysts. The results showed that CuO/CeO.sub.2 (ns) exhibited a substantially better activity than CuO/CeO.sub.2 (nc). The higher activity was associated with the unique properties of CuO/CeO.sub.2 (ns), such as the easier reduction of highly dispersed CuO to metallic Cu, the stability of metallic Cu and a larger concentration of Ce.sup.3+ in CeO.sub.2 (ns).
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-015-1482-y