Interaction of mordenite with an aromatic hydrocarbon: An embedded ONIOM study

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• 作者：Bavornpon Jansang ; Tanin Nanok ; Jumras Limtrakul
• 关键词：Mordenite ; Benzene adsorption ; ONIOM ; Embedded ONIOM
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2007
• 出版时间：1 March 2007
• 年：2007
• 卷：264
• 期：1-2
• 页码：33-39
• 全文大小：1037 K

文摘

The structure of mordenite (MOR) and its interaction with benzene has been investigated within the framework of our-own-N-layered integrated molecular orbital + molecular mechanics (ONIOM) approach utilizing the two-layer ONIOM scheme (B3LYP/6-31G(d,p):UFF). The effect of the long range interactions is also included via optimized point charges added to the ONIOM2(B3LYP/6-31G(d,p):UFF), embedded ONIOM. Inclusion of the extended zeolitic framework covering the nanocavity has an effect on the adsorption properties. The adsorption energies estimated from 3T and 12T quantum clusters of −6.0 and −6.9 kcal/mol, respectively, are significantly lower than that obtained from the 120T ONIOM2 scheme of −16.6 kcal/mol. The completed adsorption model obtained at the embedded ONIOM2(MP2/6-31G(d,p):UFF) method predicts the adsorption energy of −23.4 kcal/mol, which is comparable to the van der Waals-corrected periodic calculation adsorption energy of −21.5 kcal/mol.