Catalytic oxidation of CO over CuO/CeO2 nanocomposites synthesized via solution combustion method: effect of fuels

摘要

A series of CuO/CeO 2 catalysts were successfully synthesized via solution combustion method (SCS) using different fuels and tested for CO oxidation. The catalysts were characterized by energy-dispersive X-ray analysis (EDXA), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), N 2 adsorption-desorption isotherms and H 2 temperature-programmed reduction (H 2 -TPR). It was found that the used fuels strongly affected the characterization and the low-temperature reduction behavior of CuO/CeO 2 catalysts. The CuO/CeO 2 -urea catalyst exhibited higher catalytic activity toward CO oxidation ( t 50 =120°C, t 100 =159°C) than the 5 other synthesized catalysts. In addition, the CuO/CeO 2 -urea catalyst displayed high stability for CO oxidation during five cycles and water resistance. The enhanced catalytic CO oxidation of the synthesized samples can be attributed by a combination of factors, such as smaller crystallite size, higher specific surface area, larger amount of amorphous copper(II) oxide, more mesoporous and uniform spherical-like structure. These findings are worth considering in order to continue the study of the CuO/CeO 2 catalyst with low-temperature CO oxidation.