WO3 boosted water tolerance of Pt nanoparticle on SO42--ZrO2 for propane oxidation.

H 2 O poisoning of platinum-based catalysts for VOCs oxidation is a long-standing problem due to H 2 O strongly competitive adsorption on active sites. In this work, it is found that the H 2 O competitive adsorption on Pt active sites is effectively weakened by enhancing strong metal-support interaction (SMSI) in Pt-based catalyst. SMSI between WO 3 and Pt species occurs in the WO 3 supported Pt catalyst (Pt/WO 3) but disappears in Pt-3W/ZrO 2 due to monolayer dispersed WO 3 on ZrO 2. The formation of aggregated WO 3 species in Pt-3W/SO 4 2--ZrO 2 leads to the SMSI which is further enhanced by SO 4 2--ZrO 2. The enhanced SMSI plays critical role on weakening water vapor adsorption on active sites, thus Pt-3W/SO 4 2--ZrO 2 exhibits both highest activity (T 90 = 200 °C) and water tolerance which is much superior than Pt/ZrO 2 , Pt/WO 3 , Pt-3W/ZrO 2 and Pt/SO 4 2--ZrO 2 under wet condition (5% H 2 O). Our primary results provide a promising strategy for designing superior platinum catalysts for VOCs complete oxidation. [Display omitted] • Pt-based catalyst with high water tolerance was designed by modulating strong metal-support interaction (SMSI). • WO 3 is monolayer dispersed in Pt-3 W/ZrO 2 but aggregates in Pt-3 W/SO 4 2--ZrO 2. • SMSI disappears in Pt-3 W/ZrO 2 catalyst due to monolayer dispersed WO 3. • Aggregated WO 3 leads to SMSI which is further enhanced by SO 4 2--ZrO 2 in Pt-3 W/SO 4 2--ZrO 2. • Enhanced SMSI weakens the adsorption of water steam on active sites thus improves water tolerance of catalyst. [ABSTRACT FROM AUTHOR]