p-Xylene-selective metal-organic frameworks: a case of topology-directed selectivity.
p-Xylene-selective metal-organic frameworks: a case of topology-directed selectivity.
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DOI：
10.1021/ja207287h
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发表时间：
2011-10
影响因子：
15
通讯作者：
F. Vermoortele;M. Maes;Peyman Z. Moghadam;Matthew J. Lennox;F. Ragon;Mohammed Boulhout;Shyam Biswas-
中科院分区：
文献类型：
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作者：
F. Vermoortele;M. Maes;Peyman Z. Moghadam;Matthew J. Lennox;F. Ragon;Mohammed Boulhout;Shyam Biswas-
对二甲苯等对二取代烷烃优先吸附在三种同位结构金属-有机框架上：MIL-125(Ti) ([Ti(8)O(8)(OH)(4)（BDC)(6)]）、MIL-125(Ti)-NH(2) ([Ti(8)O(8)(OH)(4)(BDC-NH（2))(6)]）和CAU-1(Al)-NH(2) ([Al(8)(OH)(4)(OCH(3))(8)(BDC-NH(2))(6)]) （BDC = 1,4-苯二羧酸盐）。它们独特的结构包括八面体笼和更小的四面体笼，八面体笼可以根据不同的填料和与孔壁的相互作用分离分子，而四面体笼可以通过分子筛分离分子。这些实验数据与分子模拟的预测一致。额外的吸附和微量热实验提供了两种笼型在提供对选择性方面的互补作用。
Para-disubstituted alkylaromatics such as p-xylene are preferentially adsorbed from an isomer mixture on three isostructural metal-organic frameworks: MIL-125(Ti) ([Ti(8)O(8)(OH)(4)(BDC)(6)]), MIL-125(Ti)-NH(2) ([Ti(8)O(8)(OH)(4)(BDC-NH(2))(6)]), and CAU-1(Al)-NH(2) ([Al(8)(OH)(4)(OCH(3))(8)(BDC-NH(2))(6)]) (BDC = 1,4-benzenedicarboxylate). Their unique structure contains octahedral cages, which can separate molecules on the basis of differences in packing and interaction with the pore walls, as well as smaller tetrahedral cages, which are capable of separating molecules by molecular sieving. These experimental data are in line with predictions by molecular simulations. Additional adsorption and microcalorimetric experiments provide insight in the complementary role of the two cage types in providing the para selectivity.