SO_2和NO在载体γ-Al_2O_3上的相互作用  

Study on interaction of SO_2 and NO on γ-Al_2O_3 by TPD

作　　者：金正来[1] 陈敏东[1] 陈英[2] 谢颖[2] 马玉刚[2] 

机构地区：[1]南京信息工程大学环境科学与工程学院,江苏南京210044 [2]茂名学院化工所,广东茂名525000

出　　处：《工业催化》2008年第3期59-66,共8页Industrial Catalysis

基　　金：国家自然科学基金(20476032);广东省自然科学基金(7301284);茂名市科技计划项目(2006018)

摘　　要：通过分析载体γ-Al2O3在423 K吸附NO和SO2气体时的TPD和DRIFTS谱图,研究了SO2和NO在γ-Al2O3上的相互作用。结果表明,在γ-Al2O3上SO2促进NO氧化,NO促进SO2吸附,O2参与了SO2和NO之间的相互作用。机理探讨认为,NO和SO2在γ-Al2O3上吸附时至少形成两类中间体,一类中间体分解放出NO2,另一类中间体分解产生SO3,两类中间体分解后均产生氧空位,O2通过(至少为途径之一)补充氧空位重新生成晶格氧或晶格缺陷吸附氧参加SO2和NO之间的相互作用。The interaction mechanism for adsorption of SO2 and NO on γ-Al2O3 were investigated by means of Temperature-Programmed Desorption （TPD） and Diffuse Reflectance Infrared Fourier Transform Spectroscopy （DRIUTS）. TPD and DRIUTS results indicated that NO oxidation was promoted by SO2, the adsorption capability of γ-Al2O3 for SO2 was improved in the presence of NO, O2 was favorable to the interaction. It was proposed that at least two intermediates formed by the interaction between SO2 and NO on γ-Al2O3,i. e. , （SO3NO2 ） and （SO3 NO）, which decomposed to NO2 and SO3 which went into the gas phase and formed oxygen vacancies on the support. During the interaction, oxygen moved into oxygen vacancies and thus crystal oxygen was re-generated.

关 键 词：催化化学 程序升温脱附 SO2 NO 活性氧化铝 吸附 相互作用机理 

分 类 号：TQ426.65[化学工程] TQ424.25