CIESC Journal ›› 2018, Vol. 69 ›› Issue (4): 1500-1507.DOI: 10.11949/j.issn.0438-1157.20170670

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Adsorption isotherms and selectivity of CH4/C2H6/C3H8 on MOF-505@5GO

WU Houxiao, CHEN Yongwei, LIANG Junjie, SHI Renfeng, XIA Qibin, LI Zhong   

  1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2017-05-22 Revised:2017-11-28 Online:2018-04-05 Published:2018-04-05
  • Supported by:

    supported by the National Natural Science Foundation of China(21576092, 21276092, 21436005).

CH4/C2H6/C3H8在MOF-505@5GO上吸附相平衡和选择性

吴厚晓, 陈永伟, 梁俊杰, 石仁凤, 夏启斌, 李忠   

  1. 华南理工大学化学与化工学院, 广东 广州 510640
  • 通讯作者: 夏启斌
  • 基金资助:

    国家自然科学基金项目(21576092,21276092,21436005)。

Abstract:

MOF-505@GO composites with different ratios of MOF-505 to graphite oxide were synthesized by solvothermal method. They were characterized by powder X-ray diffractions(PXRD), scanning electron microscopy (SEM), Raman and porosity measurement through nitrogen adsorption. The isotherms of CH4, C2H6 and C3H8 on the MOF-505@GO and MOF-505 were measured separately. Results showed that MOF-505@5GO had the largest pore volumes and BET surface area. The pore volumes and BET surface areas of MOF-505@GO increased as the GO content increased, when GO contents increased to 8%(mass) and 10%(mass), the opposite trend was observed in which the pore volumes and BET surface areas decreased. Accordingly, MOF-505@5GO exhibited the highest CH4, C2H6 and C3H8 uptake of 0.88, 4.81 and 5.17 mmol·g-1 at 298 K and 0.1 MPa, having an increase of 14.9%, 30.7% and 13.1%, respectively. Moreover, IAST-predicted C2H6/CH4 selectivity of MOF-505@5GO was about 40.1 and C3H8/CH4 selectivity was about 3056.1. It suggests that MOF-505@5GO is a promising candidate for the separation of C2H6/CH4 and C3H8/CH4.

Key words: MOF-505@GO, methane, ethane, propane, adsorption, binary mixture

摘要:

应用溶剂热法合成了不同氧化石墨烯(GO)负载量的MOF-505@GO复合材料,分别采用全自动表面积吸附仪、P-XRD、SEM和Raman对材料进行了性能表征,测定了CH4、C2H6和C3H8在MOF-505@GO上的吸附等温线,并进行Langmuir-Freundlich方程拟合,依据IAST理论模型计算了C2H6/CH4和C3H8/CH4二元混合气在MOF-505@5GO上的吸附选择性。研究结果表明,随着GO负载量增大,MOF-505@GO复合材料的孔容及BET比表面积先增大后减小,当GO负载量为5%(质量)时,复合材料MOF-505@5GO的孔容及BET比表面积达到最大,当GO负载量进一步增大至8%(质量)和10%(质量)时,复合材料的孔容及BET比表面积逐渐降低。在0.1 MPa和298 K条件下,MOF-505@5GO对CH4、C2H6和C3H8的吸附容量分别为0.88、4.81和5.17 mmol·g-1,相比MOF-505分别提高了14.9%、30.7%和13.1%。MOF-505@5GO对C2H6/CH4和C3H8/CH4的吸附选择性分别为40.1和3056.1,其对C2H6/CH4和C3H8/CH4具有极高的吸附选择性。

关键词: MOF-505@GO, 甲烷, 乙烷, 丙烷, 吸附(作用), 二元混合物

CLC Number: