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Computer-Assisted Screening of Zeolite Catalysts for the Selective Isopropylation of Naphthalene
Molecular graphics screening of potential zeolite catalysts for the selective synthesis of 2,6-diisopropylnaphthalene indicated that mordenite was a promising candidate. Molecular mechanics calculations of the minimum energy pathway for diffusion of the diisopropylnaphthalene isomers in mordenite sh...
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Published in: | Journal of catalysis 1994-05, Vol.147 (1), p.231-240 |
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container_title | Journal of catalysis |
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creator | Horsley, J.A. Fellmann, J.D. Derouane, E.G. Freeman, C.M. |
description | Molecular graphics screening of potential zeolite catalysts for the selective synthesis of 2,6-diisopropylnaphthalene indicated that mordenite was a promising candidate. Molecular mechanics calculations of the minimum energy pathway for diffusion of the diisopropylnaphthalene isomers in mordenite showed that significant energy barriers exist for the 2,7 isomer, while the diffusion of the 2,6 isomer is unimpeded. In the case of zeolite L, no significant energy barrier was found for either isomer. In an experimental study of naphthalene isopropylation in a batch autoclave reactor, mordenite produced a 2,6/2,7 ratio of 2.5, while zeolite L was essentially nonselective. The combination of molecular graphics and molecular mechanics appears to be a powerful and reliable method for the screening of zeolites for selective catalysis. |
doi_str_mv | 10.1006/jcat.1994.1134 |
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Molecular mechanics calculations of the minimum energy pathway for diffusion of the diisopropylnaphthalene isomers in mordenite showed that significant energy barriers exist for the 2,7 isomer, while the diffusion of the 2,6 isomer is unimpeded. In the case of zeolite L, no significant energy barrier was found for either isomer. In an experimental study of naphthalene isopropylation in a batch autoclave reactor, mordenite produced a 2,6/2,7 ratio of 2.5, while zeolite L was essentially nonselective. 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Molecular mechanics calculations of the minimum energy pathway for diffusion of the diisopropylnaphthalene isomers in mordenite showed that significant energy barriers exist for the 2,7 isomer, while the diffusion of the 2,6 isomer is unimpeded. In the case of zeolite L, no significant energy barrier was found for either isomer. In an experimental study of naphthalene isopropylation in a batch autoclave reactor, mordenite produced a 2,6/2,7 ratio of 2.5, while zeolite L was essentially nonselective. The combination of molecular graphics and molecular mechanics appears to be a powerful and reliable method for the screening of zeolites for selective catalysis.</description><subject>Catalysis</subject><subject>Catalysts: preparations and properties</subject><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. 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subjects | Catalysis Catalysts: preparations and properties Chemistry Exact sciences and technology General and physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry |
title | Computer-Assisted Screening of Zeolite Catalysts for the Selective Isopropylation of Naphthalene |
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