Effect of Gold Nanoparticles on MnOx/TiO(2)Nanostructures for Improving the CO Oxidation at Low Temperature

摘要

Gold nanoparticles dispersed on MnOx/TiO(2)were used to perform the oxidation of carbon monoxide at low temperatures. Remarkable dispersion of gold nanoparticles under hydrogen treatment was obtained, mainly in Au-MnOx/TiO(2)catalysts with 2 wt% Au and 5 wt% Mn, where the Au nanoparticles displayed average sizes of 1-3 nm. The addition of Au nanoparticles to the MnOx/TiO(2)catalysts promoted both the CO oxidation from 0 degrees C and stability at room temperature. This behavior could be attributed to the synergistic interactions between Au-0/Au(1+)and Mn3+/Mn(4+)on the Au-MnOx/TiO(2)catalyst surface.