摘要
甲硫醇(CH_3SH)是一种常见的挥发性含硫有机物,其在空气中易转化形成有机气溶胶,导致大气光化学烟雾和雾霾等严重污染。因此,针对CH_3SH的有效脱除研究工作目前已成为我国严控硫污染和实现硫以及VOCs(挥发性有机化合物)减排工作中的新任务。系统研究并比较了HZSM-5,Ce O_2,Al_2O_33种催化剂应用于催化分解CH_3SH的降解行为,采用H_2-TPR,NH_3-TPD表征探讨了活性与稳定性之间的差异并进行了相应的分析,同时利用TG,Raman等表征解释了催化剂失活的原因并对其失活机制进行了简要的探究,得出催化剂酸性中心与氧空位是催化分解CH_3SH的活性中心,积碳和含硫物种是导致催化剂失活的主要原因。
Methyl mercaptan ( converted into organic aerosols CH3SH) is a common volatile sulfur-containing organic substance, which is easily in the air, resulting in atmospheric photochemical fumes and haze and other serious pollution. Therefore, the effectively removing CH3SH has become a new task for control of sulfur pollution and VOCs (volatile organic compounds). In this paper, the catalytic behavior toward CH3SH decomposition reactivity was investigated by HZSM-5, CeO2 and AI2O3 catalysts. The differences between activity and stability were investi- gated by H2-TPR and NH3-TPD. The results showed that acidity center and oxygen vacancy are the active sites of catalytic decomposition of CH3SH, carbon deposition and sulfur species are the main causes of catalyst deactiva- tion. The TG and Raman were used to explain the reason of deactivation of the catalyst.
作者
刘江平
何德东
胡亚楠
余杰
赵雨桐
罗永明
Liu Jiangping;He Dedong;Hu Yanan;Yu Jie;Zhao Yutong;Luo Yongming(Faculty of Envi-ronmental Science and Engineering,Kunming University of Science and Technology,Kunming650500,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2018年第5期550-557,共8页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(U21667016
21267011和U1402233)
云南省省级基金项目(KKSY201422060)
云南省教育厅面上基金项目(KKJA201422018)资助
关键词
甲硫醇
催化分解
活性与稳定性比较
失活
稀土
methyl mercaptan
catalytic decomposition
comparison of activity and stability
deactivation
rare earths