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

作　　者：Liu Hui Zhou Yuming Zhang Yiwei Sheng Xiaoli Zhang Zewu Zhou Shijiang 

机构地区：[1]School of Chemistry and Chemical Engineering, Southeast University [2]School of Chemistry and Chemical Engineering, Jiangsu University

出　　处：《China Petroleum Processing & Petrochemical Technology》2013年第4期54-62,共9页中国炼油与石油化工（英文版）

基　　金：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 Expenditure of Southeast University(Grant No.3207043101)

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.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.

关 键 词：impregnation sequence propane dehydrogenation PtSnNa/ZSM-5 PROPENE 

分 类 号：TE624.9[石油与天然气工程—油气加工工程]