Metal-organic frameworks as high-potential adsorbents for liquid-phase separations of olefins, alkylnaphthalenes and dichlorobenzenes

被引:106
作者
Alaerts, Luc [1 ]
Maes, Michael [1 ]
van der Veen, Monique A. [1 ]
Jacobs, Pierre A. [1 ]
De Vos, Dirk E. [1 ]
机构
[1] Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, B-3001 Louvain, Belgium
关键词
ALUMINUM TEREPHTHALATE MIL-53; SELECTIVE ADSORPTION; ALKANE/ALKENE MIXTURES; COORDINATION POLYMERS; NANOPOROUS MATERIAL; HYDROGEN STORAGE; XYLENE ISOMERS; HYDROCARBONS; CU-3(BTC)(2); ACTIVATION;
D O I
10.1039/b823233d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three metal-organic frameworks (MOFs) with similar pore window diameters, [Cu(3)(BTC)(2)], MIL-47 and MIL-53(Al), are tested for adsorption of olefins, alkylnaphthalenes and dichlorobenzenes in the liquid phase. Selective adsorption of olefins is possible only on [Cu(3)(BTC)(2)] via pi-complexation on its open metal sites. This material shows a remarkable preference for cis-olefins over trans-olefins. All three MOFs have high affinities for alkylnaphthalene and dichlorobenzene isomers. Separation of 1,4-dimethylnaphthalene from other alkylnaphthalene isomers and of p- and m-dichlorobenzene can be carried out on both MIL-47 and MIL-53(Al), as shown with breakthrough experiments. For the alkylnaphthalenes, column experiments at different concentrations point to enthalpic interactions as important factors determining selectivity, and the occurrence of steric effects during the adsorption of 1,4-dimethylnaphthalene shows that its kinetic diameter approaches the pore diameter of the adsorbents. For the dichlorobenzenes, packing effects dominate the adsorption selectivity.
引用
收藏
页码:2903 / 2911
页数:9
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