Citation: Yu-Xin Miao, Jing Wang, Wen-Cui Li. Enhanced catalytic activities and selectivities in preferential oxidation of CO over ceria-promoted Au/Al₂O₃ catalysts[J]. Chinese Journal of Catalysis, ;2016, 37(10): 1721-1728. doi: 10.1016/S1872-2067(16)62469-5 shu

Enhanced catalytic activities and selectivities in preferential oxidation of CO over ceria-promoted Au/Al₂O₃ catalysts

State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

Received Date: 26 April 2016
Revised Date: 20 May 2016

Fund Project: This work was supported by the National Basic Research Program of China (973 Program, 2013CB934104) and the National Natural Science Foundation of China (21225312, U1303192).

The preferential oxidation of CO (CO-PROX) is a hot topic because of its importance in pro-ton-exchange membrane fuel cells (PEMFCs). Au catalysts are highly active in CO oxidation. However, their activities still need to be improved at the PEMFC operating temperatures of 80-120℃. In the present study, Au nanoparticles of average size 2.6 nm supported on ceria-modified Al₂O₃ were synthesized and characterized using powder X-ray diffraction, nitrogen physisorption, transmission electron and scanning transmission electron microscopies, temperature-programmed hydrogen reduction (H₂-TPR), Raman spectroscopy, and in situ diffuse-reflectance infrared Fourier-transform spectroscopy. Highly dispersed Au nanoparticles and strong structures formed by Au-support interactions were the main active species on the ceria surface. The Raman and H₂-TPR results show that the improved catalytic performance of the Au catalysts can be attributed to enhanced strong metal-support interactions and the reducibility caused by ceria doping. The formation of oxygen vacancies on the catalysts increased their activities in CO-PROX. The synthesized Au catalysts gave excellent catalytic performances with high CO conversions (>97%) and CO₂ selectivities (>50%) in the temperature range 80-150℃.
- Gold catalysis,
- Ceria,
- Alumina,
- Preferential oxidation of carbon monoxide Deposition-precipitation,
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Enhanced catalytic activities and selectivities in preferential oxidation of CO over ceria-promoted Au/Al2O3 catalysts

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Enhanced catalytic activities and selectivities in preferential oxidation of CO over ceria-promoted Au/Al₂O₃ catalysts