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Robust Pt@TiOx/TiO2 Catalysts for Hydrocarbon Combustion: Effects of Pt-TiOx Interaction and Sulfates
journal contributionposted on 2020-11-05, 14:05 authored by Hao Hao, Baofang Jin, Wei Liu, Xiaodong Wu, Fengfu Yin, Shuang Liu
Developing platinum catalysts highly active for hydrocarbon combustion at low temperatures is crucial but yet challenging, since platinum may convert into inert PtOx in oxidizing atmospheres and deactivates during catalytic combustion. In this article, a Pt@TiOx/TiO2 catalyst with platinum nanoparticles decorated by amorphous TiOx overlayers was synthesized via a strong metal–support interaction (SMSI)-related strategy. The Pt-TiOx electronic interaction stabilized reactive Pt0 sites during reactions, resulting in outstanding activities and high stability for C3H8 and C3H6 combustion. The influences of sulfatescommon byproducts forming on catalysts applied for automobile exhaust purificationwere studied by monitoring the platinum states, the hydrocarbon adsorption behavior, and the catalytic performance of sulfated Pt@TiOx/TiO2 with in situ DRIFTS. It is suggested that the sulfates promoted C3H8 combustion via heterolytic C–H bond activation on Ptδ+–(SO4)δ− couples, while C3H6 combustion was disfavored on the sulfated catalyst because of inhibited O2 activation.
C 3 H 6 combustionplatinum catalystsPt-TiO x InteractionHydrocarbon CombustionC 3 H 8 combustionPt-TiO xSMSIO 2 activationhydrocarbon combustioninteractionreactive Pt 0 siteshydrocarbon adsorption behaviorsulfated catalystplatinum statesC 3 H 8DRIFTSoxidizing atmospheresTiO x overlayersPtO xplatinum nanoparticles