Preparation and Characterization of UiO-66-Supported Cu-Ce Bimetal Catalysts for Low-Temperature CO Oxidation.

Abstract: A series of Zr-based metal-organic frameworks (UiO-66) supported CuO-CeO₂ catalysts with various total metal loadings and various Cu/Ce ratios were prepared by using a co-impregnation method. The catalytic activities of the catalysts for low temperature oxidation of carbon monoxide were compared with that supported on the ZrO₂ and mesostructured cellular foam silica. The results show that the catalysts supported by UiO-66 are expected to give the best catalytic activity, which should be attributed to the special construction of UiO-66. The samples were further characterized by XRD, TEM, N₂ adsorption-desorption, H₂-TPR, XPS, and in situ DRIFT. And the catalyst with a bimetallic loading of 50 wt% and Cu/Ce ratio of 3:7 (wt/wt) has the highest catalytic activity, which can be attributed to the larger amount of finely dispersed Cu species strongly interacting with CeO₂, the highest amounts of oxygen vacancies and Cu⁺ species on the catalyst surface.Graphical Abstract: [ABSTRACT FROM AUTHOR]