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Effect of Impregnation Sequence on Propane Dehydrogenation Performance of PtSnNa/ZSM-5 Catalyst

ISSN号：1008-6234
期刊名称：China Petroleum Processing and Petrochemical Techn
时间：2013.12
页码：54-62
分类：O643.36[理学—物理化学;理学—化学] TQ241.21[化学工程—有机化工]
作者机构：[1]School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, [2]School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013
相关基金：The authors are grateful to the financial supports of the National Natural Science Foundation of China （Grant No.21376051, 21106017, 21306023, and 51077013）, the Natural Science Foundation of Jiangsu （Grant No. BK20131288）, the Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China （Grant No. BA2011086）, the Specialized Research Fund for the Doctoral Program of Higher Education of China （Grant No. 20100092120047）, the Key Program for the Scientific Research Guiding Fund of Basic Scientific Research Operation Expendi- ture of Southeast University （Grant No. 3207043101）, and the Instrumental Analysis Fund of Southeast University.
相关项目：叠层结构介孔SiO2/纳米Au/TiO2/SiO2催化剂的活性位二次构筑及反应性能研究

关键词： ZSM-5催化剂, 浸渍处理, 丙烷脱氢, 性能, ZSM-5沸石, 金属成分, 催化活性, X射线衍射, impregnation sequence, propane dehydrogenation, PtSnNa/ZSM-5, propene

中文摘要：

The effects of the sequence for impregnation of metal precursors on the performance of PtSnNa/ZSM-5 catalyst for propane dehydrogenation to propene were studied in this paper.Some methods such as XRD,TPDA,BET,H2-TPR,XPS,ICP,TEM and hydrogen chemisorption were used to characterize the catalysts.The structure of ZSM-5 zeolite was not destroyed by the introduction of metal components.Meanwhile the different impregnation sequence of metal precursors could affect the behavior of Sn4+species entering the ZSM-5 channel,and the interaction between platinum and tin species,as well as the degree for reduction of Pt and Sn components.As a result,the prepared catalysts exhibited different reaction activity and selectivity.Compared with the co-impregnation treated catalyst,the catalysts prepared by the sequential impregnation method showed better catalytic activity in propane dehydrogenation,especially the one prepared through impregnation with tin precursor at first.Finally,a model for the effect of impregnation sequence on the distribution of Pt and Sn species in PtSnNa/ZSM-5 catalyst was proposed.

英文摘要：

The effects of the sequence for impregnation of metal precursors on the performance of PtSnNa/ZSM-5 catalyst for propane dehydrogenation to propene were studied in this paper. Some methods such as XRD, TPDA, BET, H2-TPR, XPS, ICP, TEM and hydrogen chemisorption were used to characterize the catalysts. The structure of ZSM-5 zeolite was not destroyed by the introduction of metal components. Meanwhile the different impregnation sequence of metal precursors could affect the behavior of Sn4＋ species entering the ZSM-5 channel, and the interaction between platinum and tin species, as well as the degree for reduction of Pt and Sn components. As a result, the prepared catalysts exhibited different reac- tion activity and selectivity. Compared with the co-impregnation treated catalyst, the catalysts prepared by the sequential impregnation method showed better catalytic activity in propane dehydrogenation, especially the one prepared through impregnation with tin precursor at first. Finally, a model for the effect of impregnation sequence on the distribution of Pt and Sn species in PtSnNa/ZSM-5 catalyst was proposed.