文献类型：期刊文献

英文题名：Thermodynamics of Methane Adsorption on Copper HKUST-1 at Low Pressure

作者：Wu, Di[1,2];Guo, Xiaofeng[1,2,3];Sun, Hui[4];Navrotsky, Alexandra[1,2]

机构：[1]Univ Calif Davis, Peter A Rock Thermochem Lab, Davis, CA 95616 USA;[2]Univ Calif Davis, NEAT ORU, Davis, CA 95616 USA;[3]Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA;[4]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：6

期号：13

起止页码：2439

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY LETTERS

收录：;EI(收录号：20154801606445);WOS:【SCI-EXPANDED(收录号:WOS:000357626700006)】；

基金：This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Grant DE-FG02-05ER15667. H.S. thanks the National Natural Science Foundation of China for financial support under the National Natural Science Fund for Young Scholar (No. 21201063), the Ministry of Education of Republic of China for financial support under the Research Fund for the Doctoral Program of Higher Education of China (RFDP) (No. 20110074120020) and the Fundamental Research Funds for the Central Universities, and the China Scholarship Council for the State Scholarship Fund (No. 201308310077). We thank Manas K. Bhunia and James T. Hughes for providing the MOF material.

语种：英文

外文关键词：Calorimetry - Copper - Digital storage - Organometallics - Hydrogen storage - Chemical analysis - Natural gas - Calorimeters - Enthalpy - Crystalline materials

摘要：Metal-organic frameworks (MOFs) can be engineered as natural gas storage materials by tuning the pore structures and surface properties. Here we report the direct measurement of CH4 adsorption enthalpy on a paddlewheel MOF (Cu HKUST-1) using gas adsorption calorimetry at 25 degrees C at low pressures (below 1 bar). In this pressure region, the CH4-CH4 intermolecular interactions are minimized and the energetics solely reflects the CH4-MOF interactions. Our results suggest moderately exothermic physisorption with an enthalpy of -21.1 +/- 1.1 kJ/mol CH4 independent of coverage. This calorimetric investigation complements previous computational and crystallographic studies by providing zero coverage enthalpies of CH4 adsorption. The analysis of the new and literature data suggests that in initial stages of adsorption the CH4-HKUST-1 interaction tends to be more sensitive to the pore dimension than to the guest polarizability, suggesting a less specific chemical binding role for the open Cu site.