Wang Guangbo, Leus Karen, Couck Sarah, Tack Pieter, Depauw Hannes, Liu Ying-Ya, Vincze Laszlo, Denayer Joeri F M, Van Der Voort Pascal
COMOC - Center for Ordered Materials, Organometallics and Catalysis, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, 9000 Ghent, Belgium.
Dalton Trans. 2016 Jun 21;45(23):9485-91. doi: 10.1039/c6dt01355d. Epub 2016 May 18.
A new sulfone functionalized vanadium metal-organic framework (MOF), denoted as SO2-COMOC-2, has been synthesized solvothermally. Its structural and gas sorption properties towards CO2 and CH4 have been evaluated and compared to those of the pristine COMOC-2 material. The SO2-COMOC-2 shows a remarkable increase in CO2 capacity at ambient pressure (2.13 mmol g(-1) at 273 K vs. 1.23 mmol g(-1) for the pristine COMOC-2). Additionally, the high pressure CO2 sorption isotherm shows a distinctive two-step sorption behavior with a final capacity of 12.45 mmol g(-1) for SO2-COMOC-2 at 303 K, while for CH4 a typical Type I isotherm was obtained with a capacity of 4.13 mmol g(-1). In situ synchrotron X-ray powder diffraction measurements have been carried out to characterize the structural flexibility of the materials, showing both the presence of large pore and narrow pore form. Furthermore, synchrotron XANES and a variety of spectroscopic techniques have been utilized to verify the presence of hydroxyl groups and the existence of the mixed vanadium oxidation states in the titled MOF structure.
一种新的砜官能化钒金属有机框架材料（MOF），记为SO2-COMOC-2，已通过溶剂热法合成。已评估了其对二氧化碳和甲烷的结构及气体吸附性能，并与原始COMOC-2材料的性能进行了比较。SO2-COMOC-2在环境压力下的二氧化碳吸附量显著增加（273 K时为2.13 mmol g(-1)，而原始COMOC-2为1.23 mmol g(-1)）。此外，高压二氧化碳吸附等温线显示出独特的两步吸附行为，303 K时SO2-COMOC-2的最终吸附量为12.45 mmol g(-1)，而对于甲烷，获得了典型的I型等温线，吸附量为4.13 mmol g(-1)。已进行原位同步加速器X射线粉末衍射测量以表征材料的结构灵活性，结果表明同时存在大孔和窄孔形式。此外，同步加速器X射线吸收近边结构（XANES）和各种光谱技术已被用于验证标题MOF结构中羟基的存在以及钒混合氧化态的存在。
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