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

Keyu Jiang, Leyuan Dong, Qi Shen, Wei Wu, Xue Wu, Jian Mei () and Shijian Yang
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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

Sustainability, 2024, vol. 16, issue 6, 1-17

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.

Keywords: chlorobenzene oxidation; phosphotungstic-acid-coated cerium oxide; synergistic effect; sulfur dioxide inhibition (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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