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

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. The WO3@CeO2 catalyst with hollow structure was developed, which show better catalytic performances in NH3-SCR than traditional WO3-CeO2 catalyst, especially at low temperature (150–250 °C). [Display omitted] •The WO3@CeO2 catalyst with hollow structure was successfully developed.•The WO3@CeO2 catalyst possess high BET surface area, reducible W species, abundant chemisorbed oxygen and acid sites.•The obtained WO3@CeO2 catalyst show better NH3-SCR activity than traditional WO3-CeO2 catalyst.