Diverse Effects of SO-Induced Pt-O-SO on the Catalytic Oxidation of CH and CH.

The effects of sulfur dioxide (SO) in the catalytic purification of short-chain hydrocarbons are still controversial, and the exact role of SO on adsorption and reaction pathways during the catalytic oxidation of different volatile organic compounds (VOCs) remains unclear. Herein, a three-dimensional ordered macroporous CeZrO supported Pt nanoparticle monolithic catalyst (Pt/OM CZO) was synthesized to investigate these effects. Our findings uncover the diverse effects of SO: Upon SO treatment, the coupling between the S 3p and Pt 5d orbitals promotes the Pt-O-SO structure in situ formed on the catalyst surface. The propene (CH) molecule readily binds with the oxygen atom in Pt-O-SO, resulting in the accumulation of acetone and carbon deposition, thereby hindering CH oxidation. Conversely, a cleaved oxygen atom within the Pt-O-SO structure enhances propane (CH) adsorption and activates the C-H bond, facilitating CH oxidation. These insights are pivotal for advancing the frontier of sulfur-tolerant catalysts, addressing both economic and environmental challenges.