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

作　　者：卢泽湘 季生福 刘辉 李成岳 

机构地区：[1]State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China

出　　处：《Chinese Journal of Chemical Engineering》2008年第5期740-745,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （20376005）.

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%.一系列 Pt-Sn/SBA-15 催化剂被准备，他们使用 X 光检查描绘的性质搽粉衍射(XRD ) ， N2 吸附解吸附作用，高分辨率传播电子显微镜， X 光检查光电子光谱学(XPS ) 和 H2 温度规划了减小。他们在长链链烷除氢作用的表演作为模型链烷与 dodecane 在改正床 microreactor 被评估。结果显示 SBA-15 在反应期间维持了命令得好的 mesoporous 结构。催化剂的表演被发现没统治由它的组织上性质，但是由到管理了 Sn 的度的磅的 Sn 的臼齿的比率减小。由于 Sn 减小的最高的度， 1%( 由质量)Pt-1.8%( 由质量) Sn/SBA-15 显示出最好的催化活动。在 0.1 MPa 和 470oC，到在 4 点的链烷的氢的臼齿的比率，和液体时时空间速度(LHSV ) 20 h ? 1， dodecane 变换是 10% ，并且 dodecene 选择是大约 70% 。

关 键 词：SBA-15 catalyst PtSn alloy DODECANE DEHYDROGENATION 

分 类 号：TQ426[化学工程]