Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation

›› 2008, Vol. 16 ›› Issue (5): 740-745.

Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation

卢泽湘, 季生福, 刘辉, 李成岳

State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China

收稿日期:2007-12-06 修回日期:2008-04-14 出版日期:2008-10-28 发布日期:2008-10-28
通讯作者: LI Chengyue,E-mail:licy@mail.buct.edu.cn
基金资助:
the National Natural Science Foundation of China(20376005).

Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation

LU Zexiang, JI Shengfu, LIU Hui, LI Chengyue

State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2007-12-06 Revised:2008-04-14 Online:2008-10-28 Published:2008-10-28
Supported by:
the National Natural Science Foundation of China(20376005).

摘要/Abstract

摘要： A series of the Pt-Sn/SBA-15 catalysts were prepared and their properties characterized by using X-ray powder diffraction(XRD),N₂ adsorption-desorption,high resolution transmission electron microscope,X-ray photoelectron spectroscopy(XPS)and H₂-temperature programmed reduction.Their performances in long chain alkane dehydrogenation were evaluated in a fixed-bed microreactor with dodecane as a model alkane.The results indicated that SBA-15 maintained the well-order mesoporous structure during the reaction.The performance of the catalyst was found not dominated by its textural properties,but by the molar ratio of Sn to Pt which governed the degree of Sn reduction.Owing to the highest degree of Sn reduction,1%(by mass)Pt-1.8%(by mass)Sn/SBA-15 showed the best catalytic activity.At 0.1 MPa and 470℃,the molar ratio of hydrogen to alkane at 4,and liquid hourly space velocity(LHSV)20 h^-1,the dodecane conversion is 10%,and the dodecene selectivity is about 70%.

关键词: SBA-15 catalyst, PtSn alloy, dodecane, dehydrogenation

Abstract: A series of the Pt-Sn/SBA-15 catalysts were prepared and their properties characterized by using X-ray powder diffraction(XRD),N₂ adsorption-desorption,high resolution transmission electron microscope,X-ray photoelectron spectroscopy(XPS)and H₂-temperature programmed reduction.Their performances in long chain alkane dehydrogenation were evaluated in a fixed-bed microreactor with dodecane as a model alkane.The results indicated that SBA-15 maintained the well-order mesoporous structure during the reaction.The performance of the catalyst was found not dominated by its textural properties,but by the molar ratio of Sn to Pt which governed the degree of Sn reduction.Owing to the highest degree of Sn reduction,1%(by mass)Pt-1.8%(by mass)Sn/SBA-15 showed the best catalytic activity.At 0.1 MPa and 470℃,the molar ratio of hydrogen to alkane at 4,and liquid hourly space velocity(LHSV)20 h^-1,the dodecane conversion is 10%,and the dodecene selectivity is about 70%.

Key words: SBA-15 catalyst, PtSn alloy, dodecane, dehydrogenation

卢泽湘, 季生福, 刘辉, 李成岳. Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation[J]. , 2008, 16(5): 740-745.

LU Zexiang, JI Shengfu, LIU Hui, LI Chengyue. Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation[J]. , 2008, 16(5): 740-745.

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Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation

Preparation and Characterization of Pt-Sn/SBA-15 Catalysts and Their Catalytic Performances for Long Chain Alkane Dehydrogenation

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