铜离子交换分子筛上NO吸附的IR光谱及TPD研究  

FTIR and TPD Studies of Adsorption Properties of Nitrogen Monooxide over Copper Ion exchanged Zeolites

作　　者：张文祥[1,2] 贾明君[1,2] 张春雷[1,2] 张丽华[1,2] 吴通好[1,2] 孙铁[1,2] 八寻秀典 岩本正和[3,4] 

机构地区：[1]吉林大学化学系 [2]哈尔滨市环境监测站 [3]广岛大学工学部 [4]北海道大学触媒研究中心

出　　处：《高等学校化学学报》1998年第7期1112-1114,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：采用原位ＩＲ光谱及ＴＰＤ技术研究了ＮＯ在铜离子交换分子筛上各种表面物种的生成及脱附，并与ＮＯ在Ｃｕ－ＺＳＭ－５上的分解反应性能相关联，考察了Ｃｕ－ＺＳＭ－５反应活性高的原因及Ｏ２的生成机理．ＮＯ的吸附状态随分子筛母体种类及铜离子交换度的不同而变化，交换度较高的ＺＳＭ－５催化剂上容易形成ＮＯ－３物种，该物种对ＮＯ分解及Ｏ２的生成具有重要作用．The relations of the adsorption properties and the behavior of catalytic decomposition of nitrogen monooxide over various copper ion exchanged zeolites were studied by the means of in situ FTIR and temperature programmed desorption (TPD). The results demonstrated that NO +, O - Cu NO and NO - 3 species were formed on the surface of the zeolites and desorbed at 350￣400 K(denoted as α ), 400￣480 K( β ) and 650￣700 K( γ ), respectively. It was found that the kinds and the amounts of the species were greatly changed with the zeolite structure and the copper ion exchange level, i. e . Cu MFI, Cu MOR and Cu OFF/ERI gave α , β and γ peaks; Cu FER gave α and β peaks; Cu LTL and Cu FAU only gave α peak. The amounts of desorption were increased linearly with the exchange level of copper on Cu MFI. The O 2 desorption peak appeared at the same temperature as that of the γ peak. In addition, by comparing the present results with the behavior of catalytic decomposition of NO, it is also found that NO - 3 species play a key role in the catalytic decomposition of NO and the formation of O 2 over the zeolites.

关 键 词：铜离子交换 分子筛 一氧化氮 吸附 分解 催化剂 

分 类 号：O613.61[理学—无机化学] O643.36[理学—化学]