Ag-ZSM-5催化剂上CH_4选择催化还原NO_x的研究  

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

作　　者：程谟杰[1] 曲振平[1] 包信和[1] 石川[1,2] 杨学锋[3] 

机构地区：[1]中国科学院大连化学物理研究所催化基础国家重点实验室 [2]大连理工大学等离子体物理化学研究室,大连116024 [3]大连理工大学等离子体物理化学研究室

出　　处：《高等学校化学学报》2002年第4期628-631,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20003011)和"973"计划资助.

摘　　要：摘要 研究Ａｇ－ＺＳＭ－５催化剂上ＣＨ４选择性催化还原ＮＯｘ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ＮＯｘ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．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.

关 键 词：Ag-ZSM-5 甲烷 选择性还原 吸附物种 分子筛 银催化剂 氮氧化物 

分 类 号：O613.61[理学—无机化学] O623.11[理学—化学]