Citation: Hong Xu, Ke Ni, Xiaokun Li, Sheng Zhu, Guohong Fan. Comparative studies of leached Pt-Fe and Pt-Co catalysts for CO oxidation reactions[J]. Chinese Journal of Catalysis, ;2017, 38(7): 1261-1269. doi: 10.1016/S1872-2067(17)62838-9 shu

Comparative studies of leached Pt-Fe and Pt-Co catalysts for CO oxidation reactions

School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China

Received Date: 10 April 2017
Revised Date: 12 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21403004, 21403003).

Leached Pt-Fe and Pt-Co catalysts were prepared by acid leaching the reduced catalysts in acid solution. Oxidation treatments of leached catalysts produced the structure of metal oxides decorat-ing the surface of nanoparticles. The fully oxidized Fe₂O₃ and Co₃O₄ species on Pt nanoparticle sur-faces result in the low performance of the CO complete oxidation (COOX) reaction. In contrast, un-saturated FeO and CoO surface species can be formed during exposure to the CO preferential oxida-tion (CO-PROX) reaction with an excess of H₂, leading to a high O₂ activation ability and enhancing the CO-PROX activity. The FeO_x surface structures can be transformed between these two states by varying the reactive gas environments, exhibiting oscillating activity in these two reactions. Con-versely, the CoO surface structure formed in the H₂-rich atmosphere is stable when exposed to the COOX reaction and exhibits similar activity in these two reactions. It is hoped that this work may assist in understanding the important role of surface oxides in real reactions.
- Pt-Fe,
- Pt-Co,
- Acid leaching,
- CO oxidation,
- Surface oxide
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