OALib Journal期刊
Cu-ZSM-5分子筛催化分解及选择性催化还原NO
DOI: 10.7536/PC130857
Keywords: Cu-ZSM-5分子筛 ,NO分解反应 ,NH3-SCR-NO反应 ,CH-SCR-NO反应
Abstract:
Cu-ZSM-5分子筛因具有高的催化脱除NO活性和对环境友好等优点而引起广泛关注。本文从NO分解反应、以NH3为还原剂选择性催化还原NO（NH3-SCR-NO）和以碳氢化合物为还原剂选择性催化还原NO（CH-SCR-NO）三个方面综述了Cu-ZSM-5分子筛催化脱除NO反应机理和催化剂改进方面的研究进展，并对该领域存在的问题和发展前景做了总结和展望。Cu-ZSM-5分子筛催化分解NO被认为是最具有吸引力的脱硝方法，其通过Cu+的氧化还原过程和N2O的生成来实现；Cu-ZSM-5分子筛上NH3-SCR-NO反应具有较高的NO脱除效率，NO首先被氧化为NO2，NO2再与NH3结合为NH4NO3，NH4NO3再进一步与NO反应生成N2；CH-SCR-NO反应是利用贫燃发动机尾气中未完全燃烧的碳氢化合物为还原剂，一般认为碳氢化合物与氮氧化物生成硝基烷或亚硝基烷，再经异氰酸酯或氰化物生成终产物N2。Cu-ZSM-5分子筛存在水热稳定性差和易发生二氧化硫中毒等缺点，通过引入第二金属组分和制备整体式催化剂方法可显著改善Cu-ZSM-5分子筛的催化性能。系统了解NO脱除反应机理和活性位的作用机制可为催化剂的改进奠定理论基础，同时也有助于设计合成新型高效、环境友好的脱硝催化剂体系。
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