%0 Journal Article
%T MOF-derived high oxygen vacancies CuO/CeO2 catalysts for low-temperature CO preferential oxidation.
%A Liu F
%A Chen X
%A Jie W
%A Liu Y
%A Li C
%A Song G
%A Gong X
%A Liu Q
%A Qiu M
%A Ding S
%A Hu F
%A Gong L
%A Kawi S
%J J Colloid Interface Sci
%V 674
%N 0
%D 2024 Nov 15
%M 38955009
%F 9.965
%R 10.1016/j.jcis.2024.06.110
%X The CO preferential oxidation reaction (CO-PROX) is an effective strategy to remove residual poisonous CO in proton exchange membrane fuel cells, in which oxygen vacancies play a critical role in CO adsorption and activation. Herein, a series of CuO/CeO2 catalysts derived from Ce-MOFs precursors were synthesized using different organic ligands via the hydrothermal method and the CO-PROX performance was investigated. The CuO/CeO2-135 catalyst derived from homophthalic tricarboxylic acid (1,3,5-H3BTC) exhibited superior catalytic performance with 100 % CO conversion at a relatively low temperature (T100% = 100 °C), with a wide reaction temperature range and excellent stability. The superior catalytic properties were attributed to the structural improvements provided by the 1,3,5-H3BTC precursors and the promotional effects of oxygen vacancies. Additionally, in-situ Raman spectroscopy was performed to verify the dynamic roles of oxygen vacancies for CO adsorption and activation, while in-situ DRIFTS analysis revealed key intermediates in the CO-PROX reaction, shedding light on the mechanistic aspects of the catalytic process. This work not only demonstrates insights into the effective CuO/CeO2 catalysts for CO preferential oxidation, but also provides a feasible way to synthesize MOF-derived catalysts.