稀燃尾气NOx选择性还原催化剂的结构与性能研究

The selective catalytic reduction of NO with propylene was investigated over Ag/Al2O3 and Cu/Al2O3 catalysts using fixed-bed reactor and in situ DRIFTS. As result, NCO surface species as important reaction intermediates were observed with much higher reactivity in real reaction condition than that in vacuum. It is confirmed that the decomposition of surface organo-nitro and/or organo-nitrito such as R-ONO.and R-NO2 into surface -NCO is the key step in NOx reduction process. In addition,the difference between Ag/Al2O3 and Cu/Al2O3 the effect of H2O vapor on NOx reduction were investigated in mechanistic level.

采用实验考察与理论分析相结合的方式，重点考察催化剂在稀燃发动机（特别是柴油机）尾气条件下对NOx的还原活性，同时对催化剂进行原位和离位表征分析，并研究使用不同还原剂材料和活性中心结构与催化剂反应机理和催化性能之间的关系，并利用这些研究结果指导催化剂和催化剂—还原剂组合设计。.