Abstract High specific surface area CeMn/TiO2–SiO2 catalysts were synthesized and evaluated for the catalytic combustion of 1,2-dichlorobenzene (o-DCB). Mesoporous TiO2–SiO2 supports were prepared by evaporation-induced self-assembly (EISA) method to investigate the promotion of Si on the acid properties of TiO2. Pore structures of TiO2–SiO2 were modulated by controlling the amount of hydrochloric acid during the preparation process of mesoporous supports, and the influence of structures and physicochemical properties of CeMn/TiO2–SiO2 catalysts on the activity and stability of o-DCB catalytic combustion were thoroughly studied. The results showed that Mn cations incorporated into CeO2 fluorite structure caused the formation of more active oxygen species. The active oxygen species and high specific surface area of catalysts played significant roles in o-DCB oxidation reaction. The influence of water on o-DCB catalytic combustion was also studied, and two different observations were obtained at low or high content of water. Due to deposition of Cl species on the surface of catalyst, CeMn/TiO2–SiO2 loses partial activity during o-DCB catalytic combustion, and most of activity could be recovered through Deacon reaction.

中文翻译：

---

1,2-二氯苯在介孔TiO 2 -SiO 2 负载的CeMn 氧化物上的高效催化燃烧性能：酸性位点和氧化还原位点的影响

摘要 合成了高比表面积 CeMn/TiO2-SiO2 催化剂，并评估了其催化燃烧 1,2-二氯苯 (o-DCB) 的性能。通过蒸发诱导自组装（EISA）方法制备介孔 TiO2-SiO2 载体，以研究 Si 对 TiO2 酸性性能的促进作用。在介孔载体制备过程中通过控制盐酸用量来调节TiO2-SiO2的孔结构，研究CeMn/TiO2-SiO2催化剂的结构和理化性质对o-DCB催化燃烧活性和稳定性的影响深入研究。结果表明，结合到 CeO2 萤石结构中的 Mn 阳离子导致更多活性氧物种的形成。催化剂的活性氧和高比表面积在o-DCB氧化反应中发挥了重要作用。还研究了水对 o-DCB 催化燃烧的影响，并在低或高水含量下获得了两种不同的观察结果。由于Cl物质沉积在催化剂表面，CeMn/TiO2-SiO2在o-DCB催化燃烧过程中失去部分活性，大部分活性可以通过Deacon反应恢复。