摘要
用傅里叶红外光谱 (FTIR)方法表征了一氧化氮在Co ZSM 5上的吸附 .在Co ZSM 5上主要的吸附物种为Co2 + —(NO) 2 ,它们的红外吸附峰位为 1813和 1896cm- 1 ,Co2 + —NO吸附峰在 1939～ 1941cm- 1 区域 .并且由这些吸收峰的强度得NO的吸附量经验关系式 :CNO=INO (εNO·m 3.14 ) .由此式计算出NO在Co ZSM 5和 [Co +Mg(Sr) ] ZSM 5上的吸附NO的吸附浓度 .另用FTIR方法表征了Co ZSM 5和 [Co +Mg(Sr) ] ZSM 5的羟基峰 .这些表征为氮氧化物选择性催化还原 (SCR)
The adsorption of NO on Co/ZSM-5 zeolites with different Co content is studied by FTIR spectroscopy. The dominant NO species absorbed on Co/ZSM-5 is found to be in a dinitrosyl form, as demonstrated by the IR bands at 1813 and 1896 cm(-1). The mononitrosyl form occurs in the region of 1939-1941 cm-1 as a minor species. Based on the integrated intensities of IR bands at 1813 and 1896 cm-1, an experimental equation, i.e., C-NO = I-NO/ (epsilon(NO) (.) m/3.14), has been proposed for estimating the amount of adsorbed NO molecules (C-NO), from which the values of CNO on both Co/ZSM-5 and [ Co + Mg(Sr)/ZSM-5 have been calculated. In addition, the OH stretching region on Co/ZSM-5 and [ Co + Mg (Sr)]/ZSM-5 is studied by FTIR. These studies may provide useful information. for SCR catalysts of NOx.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第2期218-224,共7页
Acta Chimica Sinica
基金
韩国化学研究院资助项目
