CeO2/CuO/3DOM SiO2 catalysts with very high efficiency and stability for CO oxidation

Based on the urgent need for highly active and stable catalysts for CO conversion at low temperature, a CeO2/CuO/SiO2 ordered macroporous composite catalyst with a 3DOM structure was prepared. The 3DOM matrix possesses a fairly high specific surface area of 598 m(2) g(-1) and a large pore size of 250-300 nm, which stably assembles CeO2 and CuO nanoparticles but without clogging the pores. The 0.5CeO(2)/0.25CuO/3DOM SiO2 catalyst exhibits excellent catalytic activity to CO, due to the synergistic effect of CeO2, CuO and metal-support interactions. The conversion of CO can reach 100% at 160 degrees C and maintain excellent stability up to 12 h, due to the abundant lattice oxygen vacancies in CeO2. The adsorption behavior of CO molecules on the 0.5CeO(2)/0.25CuO/3DOM catalyst was further confirmed by in situ Fourier transform infrared spectroscopy, and the possible mechanism of CO oxidation was explained.

Automated summary

The CeO2/CuO/SiO2 ordered macroporous composite catalyst exhibits excellent catalytic activity and stability for CO conversion, attributed to the high specific surface area and large pore size as well as the abundance of lattice oxygen vacancies in CeO2. The adsorption behavior of CO molecules on the catalyst surface was confirmed by in situ Fourier transform infrared spectroscopy, and the mechanism of CO oxidation was explained.