Journal
ACS CATALYSIS
Volume 5, Issue 4, Pages 2088-2099Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs5014909
Keywords
copper oxide catalyst; preferential oxidation of CO; X-ray absorption fine structure; ceria support; in situ characterization; structure-activity relationship
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Funding
- National Science Foundation of China (NSFC) [21301107, 21373259, 21331001, 11079005]
- Fundamental research funding of Shandong University [2014JC005]
- Taishan Scholar project of Shandong Province (China)
- Open Funding from Beijing National Laboratory for Molecular Science
- Hundred Talents project of the Chinese Academy of Sciences
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030102]
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Copper-ceria is one of the very active catalysts for the preferential oxidation of carbon monoxide (CO-PROX) reaction, which is also a typical system in which the complexity of copper chemistry is clearly exhibited. In the present manuscript, copper-ceria catalysts with different Cu contents up to 20 wt % supported on CeO2 nanorods were synthesized by a deposition-precipitation (DP) method. The as-prepared samples were characterized by various structural and textural detections including X-ray diffraction (XRD), Vis-Raman, transmission electron microscopy (TEM), ex situ/in situ X-ray absorption fine structure (XAFS), and temperature-programmed reduction by hydrogen (H-2-TPR). It has been confirmed that the highly dispersed copper oxide (CuOx) clusters, as well as the strong interaction of Cu-[O-x]-Ce structure, were the main copper species deposited onto the ceria surface. No separated copper phase was detected for both preoxidized and prereduced samples with the Cu contents up to 10 wt %. The fresh copper-ceria catalysts were pretreated in either O-2- or H-2-atmosphere and then tested for the CO-PROX reaction at a space velocity (SV) of 60 000 mL center dot h(-1.)g(cat)(-1). The prereduced 5 and 10 wt % Cu samples exhibited excellent catalytic performance with high CO conversions (>50%, up to 100%) and O-2 selectivities (>60%, up to 100%) within a wide temperature window of 80-140 degrees C. The in situ XAFS technique was carried out to monitor the structural evolution on the copper-ceria catalysts during the PROX experiments. The X-ray absorption near edge spectra (XANES) profiles, by the aid of linear combination analysis, identified the oxidized Cu(II) were the dominant copper species in both O-2- and H-2-pretreated samples after CO-PROX at 80 degrees C. Furthermore, the extended X-ray absorption fine structure (EXAFS) fitting results, together with the corresponding H-2-TPR data distinctly determined that the highly dispersed CuOx (x = 0.2-0.5) cluster, other than the Cu-[O-x]-Ce (x = 0.7-3.2) structure, were the crucial active species for the studied CO-PROX reaction.
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