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Citation: GUO Xiang-Dan, HUANG Shi-Ping, TENG Jia-Wei, XIE Zai-Ku. Study on the Adsorption of Water on Na_nZSM-5 Type Zeolite: Molecular Simulation[J]. Acta Physico-Chimica Sinica doi: 10.1016/S1872-1508(06)60001-6 shu

Study on the Adsorption of Water on Na_nZSM-5 Type Zeolite: Molecular Simulation

1.
Division of Molecular and Materials Simulation, Key Laboratory for Nanomaterials of Ministry of Education of China, Beijing University of Chemical Technology, Beijing 100029, P. R. China; Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, P. R. China

Received Date: 4 August 2005
Available Online: 10 March 2006

Molecular dynamic (MD) quench method and grand canonical Monte Carlo method (GCMC) are used to study the adsorption of water on NanZSM-5 type zeolite. The simulated adsorption isotherm is in od agreement with the experimental data reported in literatures. Based on these facts, adsorption of water on NanZSM-5 with various nSi/nAl ratios is predicted. The simulation results indicate that nSi/nAl ratio of zeolite framework affects the water adsorption and adsorption isotherms greatly and the adsorption amount decreases as the nSi/nAl ratio increases, which can be explained by that the atomic charge of Na+ cation would influence greatly the polar water molecules due to the Coulomb force. The adsorbed water molecules are located around Na cations and Al atoms on the zeolite framework and the average number around Na cation and Al atom is four at lower loading. However, there are hydrogen bonds between the dsorbed water molecules and the oxygen atoms on the zeolite frameworks at higher loading. At the same loading, the isosteric heat decreases as the nSi/nAl ratio increases.
- Water; Adsorption; Molecular simulation; NaZSM-5; Isosteric heat
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Study on the Adsorption of Water on NanZSM-5 Type Zeolite: Molecular Simulation

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通讯作者: 陈斌, bchen63@163.com

Study on the Adsorption of Water on Na_nZSM-5 Type Zeolite: Molecular Simulation