Diverse Effects of 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 C<sub>3</sub>H<sub>8</sub>
Baojian Zhang, Yuan Yang, Juan Zheng, Dijierui Zhang, Wei Chen, Weidong Yuan, Xiaoping Chen, Rui Liu, Bosheng Chen, Liangwei Li, Limin Shi, Jinlong Wang, Zhu Luo, Yanbing Guo
Abstract
The effects of sulfur dioxide (SO 2 ) in the catalytic purification of short-chain hydrocarbons are still controversial, and the exact role of SO 2 on adsorption and reaction pathways during the catalytic oxidation of different volatile organic compounds (VOCs) remains unclear. Herein, a three-dimensional ordered macroporous Ce 0.8 Zr 0.2 O 2 supported Pt nanoparticle monolithic catalyst (Pt/OM CZO) was synthesized to investigate these effects. Our findings uncover the diverse effects of SO 2: Upon SO 2 treatment, the coupling between the S 3p and Pt 5d orbitals promotes the Pt–O–SO 3 structure in situ formed on the catalyst surface. The propene (C 3 H 6 ) molecule readily binds with the oxygen atom in Pt–O–SO 3, resulting in the accumulation of acetone and carbon deposition, thereby hindering C 3 H 6 oxidation. Conversely, a cleaved oxygen atom within the Pt–O–SO 3 structure enhances propane (C 3 H 8 ) adsorption and activates the C–H bond, facilitating C 3 H 8 oxidation. These insights are pivotal for advancing the frontier of sulfur-tolerant catalysts, addressing both economic and environmental challenges.