文献类型：期刊文献

英文题名：Tuning 1-hexene/n-hexane adsorption on MOF-74 via constructing Co-Mg bimetallic frameworks

作者：Sun, Hui[1,2];Ren, Danni[1];Kong, Ruiqi[1];Wang, Dan[1];Jiang, Hao[1];Tan, Jialun[1];Wu, Di[3,4,5];Chen, Shengwei[1];Shen, Benxian[1]

机构：[1]East China Univ Sci & Technol, Petr Proc Res Ctr, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Int Joint Res Ctr Green Energy Chem Engn, Shanghai 200237, Peoples R China;[3]Washington State Univ, Gene & Linda Voiland Sch Chem Engn & Bioengn, Pullman, WA 99163 USA;[4]Washington State Univ, Dept Chem, Pullman, WA 99163 USA;[5]Washington State Univ, Mat Sci & Engn, Pullman, WA 99163 USA

年份：2019

卷号：284

起止页码：151

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20191706824823);WOS:【SCI-EXPANDED(收录号:WOS:000469893200019)】；

基金：This work is financially supported by the National Natural Science Foundation of China (Grant 91634112 and 21878097), the Natural Science Foundation of Shanghai (Grant 16ZR1408100) and the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-16C01). D.W. acknowledges the institutional funds from the Gene and Linda Voiland School of Chemical Engineering and Bioengineering at Washington State University.

语种：英文

外文关键词：1-Hexene/n-hexane separation; Adsorption; Selectivity; MOF-74; Bimetallic

摘要：A series of bimetallic CoxMg1-x-MOF-74 (x = 0, 0.12, 0.30, 0.57, 0.78, 1) structures were synthesized by using facile solvothermal systems having different binary metal compositions. All MOF samples were characterized carefully. Both adsorption affinity to n-hexane and 1-hexene and adsorption selectivity of 1-hexene over n-hexane were evaluated by static adsorption test coupled with computer simulation. It is indicated that the Co-Mg bimetallic MOF-74 frameworks can be successfully constructed via using well-designed reactant compositions. All bimetallic MOF-74 retain almost the same crystalline structure but higher porosity as compared to their monometallic samples. In addition, both of the adsorption capacity and selectivity of Co-Mg bimetallic MOF-74 samples are found strongly dependent on their metal compositions. Specifically, Co0.30Mg0.70-MOF-74 exhibits the largest 1-hexene adsorption capacity of 152.7 mg/g and the highest 1-hexene/n-hexane selectivity of 9.74, which are 2.1-2.3 and 4.1-8.9 times higher than those of monometallic Co- or Mg-MOF-74 samples. Such improvement on adsorption ability and selectivity for olefin molecules can be attributed to the incorporation of more stable coordinatively unsaturated sites (CUS) within Mg-MOF-74 framework, leading to the synergetic effect of pore structure evolution as well as higher density of CUS metal sites in bimetallic frameworks. The tunable adsorption affinity to olefin/paraffin on MOF-74 by means of metal modification provides an approach to the efficient separation of olefins and paraffins from liquid hydrocarbon mixtures.