Metal oxide/CeO 2 nanocomposites derived from Ce-benzene tricarboxylate (Ce-BTC) adsorbing with metal acetylacetonate complexes for catalytic oxidation of carbon monoxide.

Herein, a series of metal oxide/CeO 2 (M/CeO 2 ) nanocomposites derived from Ce-benzene tricarboxylate (Ce-BTC) adsorbing with different metal acetylacetonate complexes were prepared for CO oxidation under four different CO gas atmospheres. It was demonstrated that Cu/CeO 2 exhibited the highest catalytic activity and stability in CO oxidation. Remarkably, both O 2 selectivity and CO selectivity to CO 2 are 100% in most of the investigated conditions. Several analytical tools such as N 2 adsorption-desorption and powder X-ray diffraction, were employed to characterize the prepared catalysts. In addition, the excellent catalytic performance of Cu/CeO 2 in CO oxidation was revealed by H 2 temperature-program reduction experiment, X-ray photoelectron spectroscopy, and in situ diffuse reflectance infrared Fourier transform spectroscopy. The result showed that high oxygen vacancy and high CO adsorption capacity (Cu + -CO) caused by the electron exchanges of Cu 2+ /Cu + and Ce 3+ /Ce 4+ pairs (Ce 4+ + Cu + ⇆ Ce 3+ + Cu 2+ ) are two key factors contributing to the high oxidation performance of Cu/CeO 2 catalyst.