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

doi:10.1016/S1872-2067(16)62469-5

Abstract

Abstract:

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℃.

Key words: Gold catalysis, Ceria, Alumina, Preferential oxidation of carbon monoxide Deposition-precipitation

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62469-5

https://www.cjcatal.com/EN/Y2016/V37/I10/1721

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

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