Ag-ZSM-5催化剂上CH4选择催化还原NOx的研究

摘要研究Ag-ZSM-5催化剂上CH₄选择性催化还原NO_x的反应性能,采用TPD和TPSR技术研究NO和O₂共吸附于Ag-ZSM-5催化剂表面形成的吸附物种及其和CH₄之间的反应。结果表明,Ag-ZSM-5催化剂上CH₄选择性还原NO_x活性和选择性较高。NO和O₂共吸附在Ag-ZSM-5催化剂上形成的NO₃(s)吸附物种能被CH₄还原生成N₂.在NO₃(s)和O₂共存的体系中,CH₄能优先并选择性还原NO₃(s)生成N₂.

Studies on Selectively Catalytic Reduction of NOx by Methane over Ag-ZSM-5 Catalysts

Ag-ZSM-5 catalysts were investigated for the selectively catalytic reduction of NO by methanein the excess of oxygen. The adsorption properties of NOx and the reaction of absorbed NOx with CH4 werestudied through TPD and TPSR measurements. NOx was effectively and selectively reduced by CH4 overAg-ZSM-5 catalysts. The co-adsorption of NO and O2 over Ag-ZSM-5 catalyst led to the formation of ad-sorbed NO3 species, which could be effectively reduced by CH4. Even in the presence of O2, NO3 specieswere more reactive than O2. The priority of CH4 reaction with surface NO3-species to form N2 was clearlyobserved.