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Chlorobenzene Oxidation over Phosphotungstic-Acid-Coated Cerium Oxide: Synergistic Effect of Phosphotungstic and Cerium Oxide and Inhibition Mechanism of Sulfur Dioxide

Author

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  • Keyu Jiang

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Leyuan Dong

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Qi Shen

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Wei Wu

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Xue Wu

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Jian Mei

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

  • Shijian Yang

    (School of Environment & Ecology, Jiangnan University, Wuxi 214122, China)

Abstract

Ce–based catalysts exhibit a poor stability and activity in chlorinated volatile organic compound (Cl–VOC) oxidation due to their rapid Cl poisoning. Herein, phosphotungstic acid (HPW) was coated on CeO 2 to improve its activity and stability for chlorobenzene (CB) oxidation. The HPW coating not only promoted CB adsorption onto CeO 2 , but also provided Brønsted acid sites to CeO 2 for Cl species removal as HCl, thus avoiding Cl poisoning. Hence, a synergistic effect of CeO 2 and HPW on HPW/CeO 2 was observed, resulting in superior CB oxidation activity and stability. Additionally, to improve the sulfur resistance of the catalyst, the inhibition mechanism of SO 2 on CB oxidation by HPW/CeO 2 was explored. HPW/CeO 2 was prone to sulfation due to the formation of Ce 2 (SO 4 ) 3 from the reaction of SO 2 and CeO 2 . Thus, the oxidation ability of HPW/CeO 2 ; the amount of adsorption sites for CB adsorption; and the amounts of Ce 4+ bonded with O 2− , lattice oxygen species, and adsorbed oxygen species were decreased by SO 2 . Meanwhile, SO 2 competed with CB for the adsorption sites on HPW/CeO 2 . Therefore, CB oxidation by HPW/CeO 2 was remarkably restrained by SO 2 . The present work promotes further work on Cl–VOC removal by Ce-based catalysts for anti-SO 2 poisoning modification in the future.

Suggested Citation

  • Keyu Jiang & Leyuan Dong & Qi Shen & Wei Wu & Xue Wu & Jian Mei & Shijian Yang, 2024. "Chlorobenzene Oxidation over Phosphotungstic-Acid-Coated Cerium Oxide: Synergistic Effect of Phosphotungstic and Cerium Oxide and Inhibition Mechanism of Sulfur Dioxide," Sustainability, MDPI, vol. 16(6), pages 1-17, March.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:6:p:2245-:d:1353150
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