A hollow structure WO3@CeO2 catalyst for NH3-SCR of NOx

Abstract Constructing a hollow structured Ce-based catalyst is an effective way to result in an efficient catalytic system for the selective catalytic reduction of NOx using NH3 (NH3-SCR). A WO3@CeO2 catalyst with hollow structure was successfully developed using carbon sphere as hard template, and tested for the NH3-SCR of NOx reaction. The obtained WO3@CeO2 catalyst with hollow structure exhibit higher NOx conversion (88%) than traditional WO3-CeO2 catalyst (40%) at 200 °C, and superior SO2 and H2O tolerance at 300 °C, given its high specific surface area, reducible W species, increased specific amount of chemisorbed oxygen species and acid sites.