物理化学学报 >> 1996, Vol. 12 >> Issue (02): 114-118.doi: 10.3866/PKU.WHXB19960205

研究论文 上一篇    下一篇

Pt-Ga/HZSM-5催化剂上丙烷芳构化

曹荣,侯震山,赵洪,贺迪经,陈文海   

  1. 中国科学院新疆化学研究所,乌鲁木齐 830011
  • 收稿日期:1995-03-03 修回日期:1995-07-19 发布日期:1996-02-15
  • 通讯作者: 曹荣

Propane Aromatization over Pt-Ga/HZSM-5 Catalyst

Cao Rong,Hou Zhen-Shan,Zhao Hong,He Di-Jing,Chen Wen-Hai   

  1. Xinjiang Institute of Chemistry,Chinese Academy of Sciences,Urumqi 830011
  • Received:1995-03-03 Revised:1995-07-19 Published:1996-02-15
  • Contact: Cao Rong

摘要:

考察了Pt/HZSM-5、Ga/HZSM-5和Pt-Ga/HZSM-5上的丙烷芳构化反应.其中Pt-Ga/HZSM-5双组份催化剂上有较高的丙烷反应活性和芳烃选择性.用程序升温还原(TPR)和H2化学吸附法表征催化剂,发现Pt与Ga的协同相互作用促进了Ga3+的还原,使其峰温向低温移动约70℃,且取组分催化剂中Pt的H2吸附性能大大降低,使催化剂表面乙烯加氢能力降低,从而提高了产物芳烃的选择性.Pt-Ga/HZSM-5中Pt有助于提高催化剂的稳定性.提出Pt与Ga的双功能作用.

关键词: 丙烷, 芳构化, Pt-Ga/HZSM-5, 协同双功能作用, TPR, H2化学吸附

Abstract:

 Direct conversion of propane to aromatics was investigated on Pt/HZSM5, Ga/HZSM-5 and Pt-Ga/HZSM-5 catalysts. Platinum introduction into Ga/HZSM-5 resulted in an increase of both the activity and selectivity of propane aromatization. Temperature programmed reduction (TPR) and volumetric chemisorption of H2 have been used to provide insight into the functions of Ga and Pt in Pt-Ga/HZSM-5. Synergistic action of Pt and Ga promotes the reduction of Ga3+ to Ga+ causing reduction temPerature of Ga sites shifting to a lower temperature and decreases remarkably the amounts of H2 adsorbed on Pt sites and thus decreases the ability of alkane hydrogenolysis. It was also found that Pt in Pt-Ga/HZSM-5 plays an important role to improve the catalystic stability. Bifunctional roles of Pt and Ga were proposed to understand catalytic behaviors of Pt-Ga/HZSM-5.

Key words: Propane, Aromatization, Pt-Ga/HZSM-5, TPR, Synergistic bifunctional role, H2 chemisorption