CH4/C2H6/C3H8在MOF-505@5GO上吸附相平衡和选择性

吴厚晓1 陈永伟1 梁俊杰1 石仁凤1 夏启斌1 李忠1

(1.华南理工大学化学与化工学院, 广东广州 510640)

【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;

【DOI】

【基金资助】 国家自然科学基金项目(21576092,21276092,21436005) supported by the National Natural Science Foundation of China(21576092,21276092,21436005)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 04, Pages 1500-1507

April 2018

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摘要

  • 引言
  • 1 实验部分
  • 2 结果与讨论
  • 3 结论
  • 参考文献