Diverse Effects\nof SO<sub>2</sub>‑Induced Pt–O–SO<sub>3</sub> on the Catalytic Oxidation of C<sub>3</sub>H<sub>6</sub> and\nC<sub>3</sub>H<sub>8</sub>

The effects of sulfur dioxide (SO<sub>2</sub>) in the\ncatalytic\npurification of short-chain hydrocarbons are still controversial,\nand the exact role of SO<sub>2</sub> on adsorption and reaction pathways\nduring the catalytic oxidation of different volatile organic compounds\n(VOCs) remains unclear. Herein, a three-dimensional ordered macroporous\nCe<sub>0.8</sub>Zr<sub>0.2</sub>O<sub>2</sub> supported Pt nanoparticle\nmonolithic catalyst (Pt/OM CZO) was synthesized to investigate these\neffects. Our findings uncover the diverse effects of SO<sub>2</sub>: Upon SO<sub>2</sub> treatment, the coupling between the S 3p and\nPt 5d orbitals promotes the Pt–O–SO<sub>3</sub> structure\nin situ formed on the catalyst surface. The propene (C<sub>3</sub>H<sub>6</sub>) molecule readily binds with the oxygen atom in Pt–O–SO<sub>3</sub>, resulting in the accumulation of acetone and carbon deposition,\nthereby hindering C<sub>3</sub>H<sub>6</sub> oxidation. Conversely,\na cleaved oxygen atom within the Pt–O–SO<sub>3</sub> structure enhances propane (C<sub>3</sub>H<sub>8</sub>) adsorption\nand activates the C–H bond, facilitating C<sub>3</sub>H<sub>8</sub> oxidation. These insights are pivotal for advancing the frontier\nof sulfur-tolerant catalysts, addressing both economic and environmental\nchallenges.