A novel selective catalytic reduction (SCR) catalyst with strong chlorine resistance ability is urgently needed to extend the catalyst life, when SCR technique is applied in plants with high chlorine content (e.g. municipal solid waste and medical waste incinerators). This study investigates the influences of typical chlorine-containing inorganic/organic compounds (i.e. hydrogen chloride (HCl) and o-dichlorobenzene (o-DCBz)) on NH₃-SCR of NO over MnO_x/TiO₂ and MnO_x-CeO₂/TiO₂ catalysts at low temperatures (100−250 °C). The results indicate the presence of HCl severely inhibits the NH₃-SCR reaction. On one hand, the reaction between NH₃ and HCl causes the deposition of NH₄Cl on catalyst surface and reduces the amount of NH₃; on the other hand, HCl consumes the surface acid sites which is essential to the adsorption and activation of NH₃; moreover, chlorine (Cl) atom prefers to anchor on the uncoordinated metal sites that restrains the regeneration of surface reactive oxygen species and interrupts the redox cycle of catalysts. Ce addition enhances the chlorine resistance property of MnO_x-CeO₂/TiO₂ catalyst by interacting with HCl preferentially. The negative effect of o-DCB on NH₃-SCR reaction is more serious than that of HCl below 200 °C. That’s because the competitive effect between o-DCB catalytic oxidation and deNO_x via NH₃-SCR reaction as well as the accumulation of o-DCB incomplete oxidation byproducts on catalyst surface further aggravates the catalyst deactivation induced by Cl atom.

当将SCR技术应用于高氯含量的工厂（例如城市固体废物和医疗废物焚化炉）时，迫切需要一种新型的具有强耐氯能力的选择性催化还原（SCR）催化剂来延长催化剂寿命。这项研究调查了典型的含氯无机/有机化合物（即氯化氢（HCl）和邻二氯苯（o-DCBz））对MnO _x / TiO ₂和MnO _x -CeO ₂上NO的NH ₃ -SCR的影响/ TiO ₂催化剂在低温（100-250°C）下。结果表明HCl的存在严重抑制了NH ₃ -SCR反应。一方面，NH ₃之间的反应HCl引起NH ₄ Cl在催化剂表面的沉积，减少NH ₃的含量; 另一方面，HCl消耗了表面酸性位，这对于NH ₃的吸附和活化至关重要。此外，氯（Cl）原子更喜欢锚定在未配位的金属位点上，从而限制了表面活性氧的再生并中断了催化剂的氧化还原循环。Ce的添加通过优先与HCl相互作用而提高了MnO _x -CeO ₂ / TiO ₂催化剂的耐氯性。o-DCB对NH ₃的负面影响-SCR反应比低于200°C的HCl更严重。这是因为邻二氯苯的催化氧化和DENO之间的竞争作用_X经由NH ₃ -SCR反应以及邻二氯苯不完全氧化的副产物的催化剂表面上进一步加剧由氯原子引起的催化剂失活的积累。