CH_4/C_2H_6/C_3H_8在MOF-505@5GO上吸附相平衡和选择性  

Adsorption isotherms and selectivity of CH_4/C_2H_6/C_3H_8 on MOF-505@5GO

作　　者：吴厚晓 陈永伟 梁俊杰 石仁凤 夏启斌[1] 李忠[1] WU Houxiao;CHEN Yongwei;LIANG Junjie;SHI Renfeng;XIA Qibin;LI Zhong(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《化工学报》2018年第4期1500-1507,共8页CIESC Journal

基　　金：国家自然科学基金项目(21576092;21276092;21436005)~~

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CH_4、C_2H_6和C_3H_8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C_2H_6/CH_4和C_3H_8/CH_4二元混合气在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CH_4、C_2H_6和C_3H_8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C_2H_6/CH_4和C_3H_8/CH_4的吸附选择性分别为40.1和3056.1,其对C_2H_6/CH_4和C_3H_8/CH_4具有极高的吸附选择性。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.

关 键 词：MOF-505@GO 甲烷 乙烷 丙烷 吸附(作用) 二元混合物 

分 类 号：TQ028.1[化学工程] TB34[一般工业技术—材料科学与工程]