Design of efficient noble metal single-atom and cluster catalysts toward low-temperature preferential oxidation of CO in H2

The preferential oxidation of CO in H2 is attractive for the removal of trace amounts of CO to meet the requirement of proton-exchange membrane fuel cells (PEMFCs) application. The key is to design highly effective catalysts that work well in a wide range of low tem-peratures. Here, the recent progress in Au and Pt group metal catalysts for the PROX re-action is summarized, covering those with single-atom and cluster dispersed metal species with remarkable performance. Firstly, the progress of some representative catalysts is overviewed, with an emphasis on the strategies for improving low-temperature activity, selectivity, and stability. Then, special attention is focused on the key parameters affecting performance in the PROX reaction. Moreover, the reaction mechanisms in terms of adsorption and activation of reactants are discussed. Finally, the challenges and oppor-tunities are offered for guiding the design of advanced noble metal catalysts toward the PROX process. & COPY; 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

This article summarizes the recent progress in Au and Pt group metal catalysts for the preferential oxidation of CO in H2, including catalysts with single-atom and cluster dispersed metal species. Firstly, the progress of representative catalysts is overviewed with a focus on strategies to improve low-temperature activity, selectivity, and stability. The key parameters affecting performance in the PROX reaction are then discussed, along with the reaction mechanisms of reactant adsorption and activation. Finally, the challenges and opportunities for designing advanced noble metal catalysts for the PROX process are presented.