Effect of H2O on catalytic performance of MOx and Au/MOx catalysts for CO oxidation

MOx and Au/MOx catalysts were prepared by the coprecipitation method and th eir catalytic performance for CO oxidation was evaluated through the feedin g gas with or without water vapor. The results showed that the activity and the stability of MO, catalysts are greatly dependent on the kinds of metal oxides. The activity order of MOx is Co3O4 > NiO > Fe2O3 > CuO > MnOx > Zn O > Al2O3 > Cr2O3 > CaO > La2O3. The water has negative effect on the activ ity of MOx (M = Co, Cu, Fe, Mn, Ni and Zn) catalysts. The catalytic activit y and stability of Au/MOx catalysts are greatly dependent on the properties of MOx. The water has negative effect on the activity of Au/MOx (M = Ca, C r, Cu, La and Mn) and on the stability of Au/MOx (M = Al, Co, Fe, Mn, Ni an d Zn) at ambient temperature.