柔性金属-有机骨架材料中轻烃的选择性滞后吸附,Chemistry of Materials

当前位置： X-MOL 学术 › Chem. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

柔性金属-有机骨架材料中轻烃的选择性滞后吸附
Chemistry of Materials ( IF 7.2 ) Pub Date : 2016-03-31 00:00:00 , DOI: 10.1021/acs.chemmater.6b00443
Shan Gao _{1,

2} , Christopher G. Morris _{1,

2,

3} , Zhenzhong Lu ₂ , Yong Yan ₂ , Harry G. W. Godfrey ₂ , Claire Murray ₃ , Chiu C. Tang ₃ , K. Mark Thomas ₄ , Sihai Yang ₂ , Martin Schröder ₂

Affiliation

多孔MFM-202a（MFM =曼彻斯特骨架材料，代替NOTT名称）显示出极高的乙炔吸收率，在195 K和1.0 bar下的18.3 mmol g ^–1（47.6 wt％），代表了迄今为止报道的最高值。框架材料。但是，在293 K和10 bar C ₂ H ₆吸收（9.13 mmol g – ¹）是优选的。基于双站点Langmuir-Freundlich（DSLF）和基于数值积分（NI）的IAST方法已用于分析C ₁至C _3的选择性碳氢化合物。MFM-202a表现出乙炔的广泛滞后解吸。这种行为对于实际的气体存储很重要，因为它允许气体在高压下被吸附但在相对较低的压力下存储。对于MFM-202a中其他不饱和轻烃（乙烷和丙烯）的吸附，也观察到逐步吸收和滞后释放，而对于饱和烃（甲烷，乙烷和丙烷）则没有观察到。MFM-202a已通过原位研究同步加速器X射线粉末衍射可揭示骨架主体可能的相变与气体负载的关系。使用IAST计算和双组分混合气体吸附实验对这些轻烃之间的选择性进行了综合分析，并在理论和实验之间取得了很好的一致性。

"点击查看英文标题和摘要"

Selective Hysteretic Sorption of Light Hydrocarbons in a Flexible Metal–Organic Framework Material

Porous MFM-202a (MFM = Manchester Framework Material, replacing the NOTT designation) shows an exceptionally high uptake of acetylene, 18.3 mmol g^–1 (47.6 wt %) at 195 K and 1.0 bar, representing the highest value reported to date for a framework material. However, at 293 K and 10 bar C₂H₆ uptake (9.13 mmol g^–1) is preferred. Dual-site Langmuir-Freundlich (DSLF)- and Numerical Integration (NI)-based IAST methods have been used to analyze selectivities for C₁ to C₃ hydrocarbons. MFM-202a exhibits broadly hysteretic desorption of acetylene; such behavior is important for practical gas storage since it allows the gas to be adsorbed at high pressure but stored at relatively low pressure. Stepwise uptake and hysteretic release were also observed for adsorption of other unsaturated light hydrocarbons (ethane and propene) in MFM-202a but not for saturated hydrocarbons (methane, ethane, and propane). MFM-202a has been studied by in situ synchrotron X-ray powder diffraction to reveal the possible phase transition of the framework host as a function of gas loading. A comprehensive analysis for the selectivities between these light hydrocarbons has been conducted using both IAST calculation and dual-component mixed-gas adsorption experiments, and excellent agreement between theory and experiment was achieved.

更新日期：2016-03-31

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南