石油炼制与化工 ›› 2019, Vol. 50 ›› Issue (3): 41-47.

• 催化剂 • 上一篇    下一篇

TPAOH处理HZSM-5分子筛及其催化丙烷脱氢反应性能研究

徐国皓1,余金鹏1,2,徐华胜1,2,王鹏飞1,2   

  1. 1. 上海化工研究院有限公司
    2. 上海绿强新材料有限公司
  • 收稿日期:2018-06-21 修回日期:2018-09-24 出版日期:2019-03-12 发布日期:2019-03-26
  • 通讯作者: 徐国皓 E-mail:1447667520@qq.com
  • 基金资助:
    上海市科技人才计划项目

TPAOH TREATMENT OF HZSM-5 ZEOLITES AND THEIR PROPANE DEHYDROGENATION PERFORMANCE

    

  1.  
  • Received:2018-06-21 Revised:2018-09-24 Online:2019-03-12 Published:2019-03-26
  • Supported by:
     

摘要: 用不同浓度的四丙基氢氧化铵(TPAOH)溶液对HZSM-5分子筛进行处理,对碱处理前后的HZSM-5分子筛负载Pt,制备Pt/HZSM-5催化剂用于丙烷脱氢反应。利用XRD、SEM、N2吸附-脱附、NH3-TPD、H2化学吸附、FT-IR和TG等手段对处理前后的HZSM-5分子筛进行表征,考察了不同浓度的TPAOH溶液处理对HZSM-5分子筛的晶体结构、表面形貌、孔结构、表面酸性及丙烷脱氢性能的影响。结果表明:采用TPAOH溶液处理HZSM-5分子筛,能够在对分子筛的晶体结构和表面形貌影响较小的基础上有效地引入介孔结构,具有高度的可调控性,且能够调变HZSM-5分子筛的酸性;随TPAOH溶液浓度的增加,丙烷脱氢反应活性先升高后降低,当TPAOH溶液浓度为0.2 mol/L时,丙烷初始转化率和丙烯选择性均达到最高值,分别为32.7%和98.6%。

关键词: 四丙基氢氧化铵, HZSM-5, 碱处理, 丙烷脱氢

Abstract: HZSM-5 zeolites were treated with different concentrations of TPAOH solutions. Pt/HZSM-5 catalysts were prepared for propane dehydrogenation by loading Pt on HZSM-5 zeolites before and after alkaline treatment. The HZSM-5 samples before and after alkaline treatment were characterized by XRD, SEM, BET, NH3-TPD, H2 chemisorption, FT-IR and TG techniques to investigate the effects of different concentrations of TPAOH solutions on the crystal structure, surface morphology, pore structure, surface acidity. The propane dehydrogenation on Pt/HZSM-5 catalysts was tested. The results showed that the treatment of HZSM-5 by TPAOH solution could effectively introduce mesoporous structure with less influence on the crystal structure and surface morphology of the zeolite, the formation of mesoporous structure is highly adjustable and could modulate the acidity of HZSM-5 zeolites. With the increase of TPAOH concentration, the activity of propane dehydrogenation increases first and then decreases. When the concentration of TPAOH solution is 0.2 mol/L, the initial propane conversion and propene selectivity are 32.7% and 98.6%, respectively.

Key words: TPAOH, HZSM-5, alkali treatment, propane dehydrogenation

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