Mechanochemically activated Au/CeO2 for enhanced CO oxidation and COPrOx reaction
Cita com:
hdl:2117/393038
Document typeArticle
Defense date2023-08-01
PublisherElsevier
Rights accessOpen Access
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Abstract
COPrOx reaction is one of the particularly appealing and cost-effective solutions for the selective oxidation of CO in hydrogen-rich gas streams to meet the stringent requirement of the current electrocatalysts employed in low-temperature fuel cells. Herein, we synthesized ultrasmall Au clusters supported on ceria by one-step solvent-free mechanochemical method. These catalysts exhibited higher activity for COPrOx and CO oxidation compared to the sample prepared by conventional incipient wetness impregnation. The unique Au-Ce interaction caused by impact and friction between the ball, vessel, and powders, greatly promotes the generation of positive charged Aud+ active sites and, at the same time, the reducibility of the catalyst. Interestingly, an aging treatment of the ball-milled samples resulted in a significant superior performance of the catalytic activity. This enhancement has been attributed to a change in the oxidation state of Au between the fresh and the aged catalysts prepared by ball milling.
CitationGe, S. [et al.]. Mechanochemically activated Au/CeO2 for enhanced CO oxidation and COPrOx reaction. "Applied materials today", 1 Agost 2023, vol. 33, núm. 101857.
ISSN2352-9407
Publisher versionhttps://www.sciencedirect.com/science/article/pii/S2352940723001270
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