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.