Ce改性HZSM-5分子筛催化降解甲硫醇（CH3SH）的研究  

Catalytic Decomposition of Methyl Mercaptan over Ce Modified HZSM-5 Zeolites

作　　者：郝湖生 何德东 陈定凯 陆继长[1] 刘峰[1] 陈然[1] 钟丽萍[1] 韩彩芸[1] 高晓亚[1] 罗永明[1] 

机构地区：[1]昆明理工大学环境科学与工程学院

出　　处：《昆明理工大学学报（自然科学版）》2017年第2期89-94,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(U1402233,21267011,21367015)

摘　　要：采用浸渍法制备了一系列不同含量Ce改性的HZSM-5分子筛催化剂,考察它们在催化分解甲硫醇反应中的催化活性.通过XRD、BET、H2-TPR、NH3-TPD和CO2-TPD等手段对其物化性能进行表征,并讨论反应温度对不同Ce含量的HZSM-5分子筛催化活性的影响.结果表明：当Ce的含量为1%时,CeO2高度分散在HZSM-5分子筛上;当Ce含量增加时,生成结晶态的CeO2,且随Ce含量的增加,结晶态的CeO2越多,所以含量较高的Ce改性HZSM-5分子筛存在明显的还原性能,能够促进甲硫醇的催化分解;稀土Ce的引入还能够调控HZSM-5分子筛的酸碱性,而表面酸碱量的变化同时也影响了HZSM-5分子筛催化分解甲硫醇的活性.A series of modified HZSM-5 zeolites with different Ce contents are prepared by an incipient-wetness impregnation method and are evaluated by conducting CH3SH catalytic decomposition tests. The physical and chemical properties of the synthesized catalysts are then characterized by XRD,BET,H2-TPR,NH3-TPD and CO2-TPD. It is shown through the results that the chemical state of Ce loaded on the HZSM-5 is closely associated with its content. When the content of Ce is 1%,high dispersion of CeO2 is presented on the surface of the HZSM-5 zeolites. While at higher content,CeO2 crystalline phase appear and they display obvious reducibility,which would be in favour of improving the activity for CH3SH catalytic decomposition. Furthermore,the introduction of Ce can effectively regulate the acidity and basicity of the catalysts and the acid-base properties of the catalysts are proved to be closely related to the catalytic activity.

关 键 词：Ce改性 HZSM-5分子筛 甲硫醇 还原性 酸碱性 

分 类 号：U461[机械工程—车辆工程] TP308[交通运输工程—载运工具运用工程]