SCI和EI收录∣中国化工学会会刊

›› 2014, Vol. 22 ›› Issue (9): 962-967.DOI: 10.1016/j.cjche.2014.06.031

• 分离科学与工程 • 上一篇    下一篇

Heterogeneity of Adsorption Sites and Adsorption Kinetics of n-Hexane on Metal-Organic Framework MIL-101(Cr)

Xuejiao Sun, Jinpeng Miao, Jing Xiao, Qibin Xia, Zhenxia Zhao   

  1. School of Chemistry & Chemical Engineering, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510640, China
  • 收稿日期:2013-07-17 修回日期:2014-01-06 出版日期:2014-09-28 发布日期:2014-11-04
  • 通讯作者: Qibin Xia
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21276092), the Research Foundation of State Key Lab of Subtropical Building Science of China (C713001z), the Science and Technology Research Foundation of Guangzhou City, China (200910814001) and Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (2011A060901011), and the Fundamental Research Funds for the Central Universities (2013ZZ0060 and 2013ZM0056).

Heterogeneity of Adsorption Sites and Adsorption Kinetics of n-Hexane on Metal-Organic Framework MIL-101(Cr)

Xuejiao Sun, Jinpeng Miao, Jing Xiao, Qibin Xia, Zhenxia Zhao   

  1. School of Chemistry & Chemical Engineering, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510640, China
  • Received:2013-07-17 Revised:2014-01-06 Online:2014-09-28 Published:2014-11-04
  • Supported by:
    Supported by the National Natural Science Foundation of China (21276092), the Research Foundation of State Key Lab of Subtropical Building Science of China (C713001z), the Science and Technology Research Foundation of Guangzhou City, China (200910814001) and Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control (2011A060901011), and the Fundamental Research Funds for the Central Universities (2013ZZ0060 and 2013ZM0056).

摘要: The heterogeneity of adsorption sites and adsorption kinetics of n-hexane on a chromium terephthalate-based metal-organic framework MIL-101(Cr) were studied by gravimetric method and temperature-programmed desorption (TPD) experiments. The MIL-101 crystals were synthesized by microwave irradiation method. The adsorption isotherms and kinetic curves of n-hexane on the MIL-101 were measured. Desorption activation energies of n-hexane fromthe MIL-101 were estimated by TPD experiments. The results showed that equilibrium amount of n-hexane adsorbed on the MIL-101 was up to 5.62 mmol·g-1 at 298 K and 1.6×104 Pa, much higher than that of some activated carbons, zeolites and so on. The isotherms of n-hexane on the MIL-101 could bewell fitted with Langmuir-Freundlich model. TPD spectra exhibit two types of adsorption sites on the MIL-101 with desorption activation energies of 39.41 and 86.69 kJ·mol-1. It reflects the surface energy heterogeneity on the MIL-101 frameworks for n-hexane adsorption. The diffusion coefficients of n-hexane are in the range of (1.35-2.35)×10-10 cm2·s-1 with adsorption activation energy of 16.33 kJ·mol-1.

关键词: Adsorption, Kinetics, n-Hexane, MIL-101, Heterogeneity

Abstract: The heterogeneity of adsorption sites and adsorption kinetics of n-hexane on a chromium terephthalate-based metal-organic framework MIL-101(Cr) were studied by gravimetric method and temperature-programmed desorption (TPD) experiments. The MIL-101 crystals were synthesized by microwave irradiation method. The adsorption isotherms and kinetic curves of n-hexane on the MIL-101 were measured. Desorption activation energies of n-hexane fromthe MIL-101 were estimated by TPD experiments. The results showed that equilibrium amount of n-hexane adsorbed on the MIL-101 was up to 5.62 mmol·g-1 at 298 K and 1.6×104 Pa, much higher than that of some activated carbons, zeolites and so on. The isotherms of n-hexane on the MIL-101 could bewell fitted with Langmuir-Freundlich model. TPD spectra exhibit two types of adsorption sites on the MIL-101 with desorption activation energies of 39.41 and 86.69 kJ·mol-1. It reflects the surface energy heterogeneity on the MIL-101 frameworks for n-hexane adsorption. The diffusion coefficients of n-hexane are in the range of (1.35-2.35)×10-10 cm2·s-1 with adsorption activation energy of 16.33 kJ·mol-1.

Key words: Adsorption, Kinetics, n-Hexane, MIL-101, Heterogeneity