SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (1): 127-136.doi: 10.1016/j.cjche.2017.05.023

• Catalysis, kinetics and reaction engineering • 上一篇    下一篇

Regulation of isobutane/1-butene adsorption behaviors on the acidic ionic liquids-functionalized MCM-22 zeolite

Keting Jin, Tao Zhang, Shaojun Yuan, Shengwei Tang   

  1. Multi-phase Mass Transfer and Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • 收稿日期:2017-02-16 修回日期:2017-05-03 出版日期:2018-01-28 发布日期:2018-03-01
  • 通讯作者: Shengwei Tang,E-mail address:tangdynasty@scu.edu.cn E-mail:tangdynasty@scu.edu.cn
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21576168, 21276163).

Regulation of isobutane/1-butene adsorption behaviors on the acidic ionic liquids-functionalized MCM-22 zeolite

Keting Jin, Tao Zhang, Shaojun Yuan, Shengwei Tang   

  1. Multi-phase Mass Transfer and Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2017-02-16 Revised:2017-05-03 Online:2018-01-28 Published:2018-03-01
  • Contact: Shengwei Tang,E-mail address:tangdynasty@scu.edu.cn E-mail:tangdynasty@scu.edu.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China (21576168, 21276163).

摘要: The adsorption ratio of isobutane/1-butene on the catalyst surface is one of the most important factors for the C4 alkylation process. Regulation of isobutane/1-butene adsorption ratio on the zeolite-supported acid catalyst is a big challenge for catalyst preparation. To regulate the isobutane/1-butene adsorption ratio, four types of ionic liquid (i.e., IL) with different alkyl chain lengths and different acid group numbers were synthesized and were subsequently immobilized onto the MCM-22 zeolite. The as-synthesized IL-immobilized MCM-22 (i.e., MCM-22-IL) was characterized by FTIR, TGA, BET, XPS and XRD, and their adsorption capacities and adsorption molar ratios of isobutane to 1-butene (I/O) were investigated to correlate with surface features of MCM-22-IL. Results showed that the immobilization of ILs led to a decrease of specific surface area and pore volume. But the surface density of acid groups was increased and the adsorption molar ratio of isobutane/1-butene (I/O) was significantly improved by the immobilization of ionic liquids. The adsorption molar ratio of I/O is substantially improved from 0.75 to above 0.9 at 300 kPa upon immobilizing ILs. Although the alkyl chain length of ILs was found to have little effect on the adsorption molar ratio of I/O, the increase of acid group numbers led to a dramatic decrease in the adsorption I/O ratio. The results illustrated that immobilizing ionic liquids is an effective way to modify the textural, chemical and morphological properties of MCM-22. Accordingly, the immobilization of ionic liquids provides a novel and a feasible way to regulate the adsorption I/O ratio on an adsorbent or a solid catalyst.

关键词: Adsorption, Catalyst, Ionic liquids, Isobutane, 1-Butene

Abstract: The adsorption ratio of isobutane/1-butene on the catalyst surface is one of the most important factors for the C4 alkylation process. Regulation of isobutane/1-butene adsorption ratio on the zeolite-supported acid catalyst is a big challenge for catalyst preparation. To regulate the isobutane/1-butene adsorption ratio, four types of ionic liquid (i.e., IL) with different alkyl chain lengths and different acid group numbers were synthesized and were subsequently immobilized onto the MCM-22 zeolite. The as-synthesized IL-immobilized MCM-22 (i.e., MCM-22-IL) was characterized by FTIR, TGA, BET, XPS and XRD, and their adsorption capacities and adsorption molar ratios of isobutane to 1-butene (I/O) were investigated to correlate with surface features of MCM-22-IL. Results showed that the immobilization of ILs led to a decrease of specific surface area and pore volume. But the surface density of acid groups was increased and the adsorption molar ratio of isobutane/1-butene (I/O) was significantly improved by the immobilization of ionic liquids. The adsorption molar ratio of I/O is substantially improved from 0.75 to above 0.9 at 300 kPa upon immobilizing ILs. Although the alkyl chain length of ILs was found to have little effect on the adsorption molar ratio of I/O, the increase of acid group numbers led to a dramatic decrease in the adsorption I/O ratio. The results illustrated that immobilizing ionic liquids is an effective way to modify the textural, chemical and morphological properties of MCM-22. Accordingly, the immobilization of ionic liquids provides a novel and a feasible way to regulate the adsorption I/O ratio on an adsorbent or a solid catalyst.

Key words: Adsorption, Catalyst, Ionic liquids, Isobutane, 1-Butene