中国炼油与石油化工 ›› 2012, Vol. 14 ›› Issue (1): 37-45.

• Scientific Research • 上一篇    下一篇

Sn的添加对AlSBA-15负载的PtNa催化剂在丙烷脱氢反应性能的研究

段永正   

  1. 东南大学化学化工学院
  • 收稿日期:2011-06-07 修回日期:2011-07-21 出版日期:2012-03-30 发布日期:2012-03-30
  • 通讯作者: 段永正 E-mail:seuduan@163.com

Propane Dehydrogenation on PtSnNa/AlSBA-15 Catalyst:

  • Received:2011-06-07 Revised:2011-07-21 Online:2012-03-30 Published:2012-03-30

摘要: 具有不同Sn含量的PtSnNa/AlSBA-15催化剂用于丙烷脱氢反应。所有的催化剂用 XRF, BET, 氢气化学吸附,NH3-TPD, H2-TPR 和TPO进行表征。实验结果发现sn的存在不但能修饰催化剂的酸功能,而且改变金属与载体之间的作用力,这将有效地降低积炭的生成。在所研究的催化剂中 PtSn(0.7%)Na/AlSBA-15 具有最佳的催化性能。进一步的添加Sn,会导致更多单质Sn的生成,这将对催化剂带来相反的效果。对 PtSn(0.7%)Na/AlSBA-15 催化剂进行试验条件优化,发现质量空速为3h-1, 反应温度为610oC 以及H2/C3H8 摩尔比为0.25会具有最佳丙烷转化率。

Abstract: PtSnNa/AlSBA-15 catalysts with different amounts of Sn were prepared for propane dehydrogenation. The catalysts were characterized by XRF, BET, H2 chemisorption,NH3-TPD, H2-TPR, and TPO. Results indicated that the presence of tin not only modified the acid function and the interfacial character between metal and support but also reduced the coke deposition effectively. Among these catalysts investigated, the PtSn(0.7%)Na/AlSBA-15 catalyst had the best catalytic performance in terms of propane conversion and stability. With the continuous addition of Sn, more amounts of Sn0 species appeared, which was unfavorable to the reaction. The PtSn(0.7%)Na/AlSBA-15 catalyst was parametrically characterized in order to obtain necessary information to integrate the process operating conditions. The weight hourly space velocity 3h-1, temperature 610oC and H2/C3H8 molar ration 0.25 were found to be optimum for higher dehydrogenation activity.