SCI和EI收录∣中国化工学会会刊

›› 2016, Vol. 24 ›› Issue (12): 1703-1711.DOI: 10.1016/j.cjche.2016.05.033

• Separation Science and Engineering • Previous Articles     Next Articles

MCM-36 zeolites tailored with acidic ionic liquid to regulate adsorption properties of isobutane and 1-butene

Hongxia Li, Tao Zhang, Shaojun Yuan, Shengwei Tang   

  1. Multiphase Mass Transfer and Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • Received:2016-02-09 Revised:2016-05-27 Online:2017-01-04 Published:2016-12-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (No. 21276163, and No. 21576168).

MCM-36 zeolites tailored with acidic ionic liquid to regulate adsorption properties of isobutane and 1-butene

Hongxia Li, Tao Zhang, Shaojun Yuan, Shengwei Tang   

  1. Multiphase Mass Transfer and Reaction Engineering Lab, College of Chemical Engineering, Sichuan University, Chengdu 610065, China
  • 通讯作者: Shengwei Tang,Tel.:+862885405201;fax:+862885405201. E-mail address:tangdynasty@scu.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (No. 21276163, and No. 21576168).

Abstract: Adsorption properties of an adsorbent or a catalyst towards adsorbates are crucial in the process of adsorption separation or catalytic reaction. Surface morphology and structure of adsorbents have a significant impact on the adsorption properties. In this study, a novel acidic ionic liquid, 1-butyl-3-(triethoxysilylpropyl)imidazolium hydrogen sulfate (i.e.,[BTPIm] [HSO4]), was synthesized and subsequently grafted onto the MCM-36 zeolite for the regulation of its adsorption properties towards isobutane and 1-butene. The resultant[BTPIm] [HSO4]-immobilized MCM-36 (i.e., MCM-36-IL) was characterized by FT-IR, XPS, XRD, SEM, TG/DTG and N2 adsorption-desorption measurement. It was found that the specific surface area, micropore volume and mesopore volume of the MCM-36 support underwent a reduction upon the immobilization of ionic liquid, while the surface density of acid increased from 0.0014 to 0.0035 mmol·m-2. The adsorption capacity of isobutane and 1-butene on the MCM-36-IL was determined by a static volumetric method. Results demonstrated that the interaction between isobutane and MCM-36-IL was enhanced and the interaction between 1-butene and MCM-36-IL was reduced. As a result, a tunable adsorption ratio of isobutane/1-butene on MCM-36 was achieved. With the increase in surface density of acid and the tunable adsorption ratio of isobutane and 1-butene on the functionalized MCM-36, the acidic ionic liquid-immobilized zeolites are beneficial to obtain an improved reaction yield and a prolonged catalyst life in the reactions catalyzed by solid acid.

Key words: Zeolite, Ionic liquid, Isobutane, 1-Butene, Adsorption

摘要: Adsorption properties of an adsorbent or a catalyst towards adsorbates are crucial in the process of adsorption separation or catalytic reaction. Surface morphology and structure of adsorbents have a significant impact on the adsorption properties. In this study, a novel acidic ionic liquid, 1-butyl-3-(triethoxysilylpropyl)imidazolium hydrogen sulfate (i.e.,[BTPIm] [HSO4]), was synthesized and subsequently grafted onto the MCM-36 zeolite for the regulation of its adsorption properties towards isobutane and 1-butene. The resultant[BTPIm] [HSO4]-immobilized MCM-36 (i.e., MCM-36-IL) was characterized by FT-IR, XPS, XRD, SEM, TG/DTG and N2 adsorption-desorption measurement. It was found that the specific surface area, micropore volume and mesopore volume of the MCM-36 support underwent a reduction upon the immobilization of ionic liquid, while the surface density of acid increased from 0.0014 to 0.0035 mmol·m-2. The adsorption capacity of isobutane and 1-butene on the MCM-36-IL was determined by a static volumetric method. Results demonstrated that the interaction between isobutane and MCM-36-IL was enhanced and the interaction between 1-butene and MCM-36-IL was reduced. As a result, a tunable adsorption ratio of isobutane/1-butene on MCM-36 was achieved. With the increase in surface density of acid and the tunable adsorption ratio of isobutane and 1-butene on the functionalized MCM-36, the acidic ionic liquid-immobilized zeolites are beneficial to obtain an improved reaction yield and a prolonged catalyst life in the reactions catalyzed by solid acid.

关键词: Zeolite, Ionic liquid, Isobutane, 1-Butene, Adsorption