Effect of doping elements on oxygen vacancies and lattice oxygen in CeO2CuO catalysts

Abstract Both oxygen vacancies and lattice oxygen play important roles in CeO 2 CuO catalysts because their concentration and distribution dominate redox properties of two oxides in hydrogen-rich streams. Herein MO X /CeO 2 CuO (M = Fe, Co and Ni) catalysts are prepared in order to modulate oxygen vacancies and lattice oxygen. It is found that MO X introduction increases the BET surface area of CeO 2 CuO catalysts and promotes the formation of Ce 3+ and oxygen vacancies. The NiO/CeO 2 CuO exhibits the highest catalytic activity and widest temperature window of complete CO conversion, which is attributed to high concentration oxygen vacancies and lattice oxygen. The deactivation of NiO/CeO 2 CuO could originate from the decrease of lattice oxygen and the weakening of the interaction between CeO 2 and CuO.