The isopropylation of naphthalene with propene over H-mordenite: the catalysis at the internal and external acid sites
Date
2014
Authors
Sugi, Y.
Anand, C.
Subramaniam, V.P.
Stalin, J.
Choy, J.H.
Cha, W.S.
Elzatahry, A.A.
Tamada, H.
Komura, K.
Vinu, A.
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Advisors
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Journal article
Citation
Molecular Catalysis, 2014; 395:543-552
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Abstract
The isopropylation of naphthalene (NP) with propene over H-Mordenite (MOR) was studied under a wide range of reaction parameters: temperature, propene pressure, period, and NP/MOR ratio. Selective formation of 2,6-diisopropylnaphthalene (2,6-DIPN) was observed at reaction conditions, such as at low reaction temperature, under high propene pressure, and/or with high NP/MOR ratio. However, the decrease in the selectivities for 2,6-DIPN was observed at reaction conditions such as at high temperature, under low propene pressure, and/or with low NP/MOR ratio. The selectivities for 2,6-DIPN in the encapsulated products were remained high and constant under all reaction conditions. These results indicate that the selective formation of 2,6-DIPN occurs through the least bulky transition state due to the exclusion of the bulky isomers by the MOR channels. The decrease in the selectivities for 2,6-DIPN are due to the isomerization of 2,6-DIPN to 2,7-DIPN at the external acid sites, directing towards thermodynamic equilibrium of DIPN isomers.
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Link to a related website: https://espace.library.uq.edu.au/view/UQ:345320/UQ345320_OA.pdf, Open Access via Unpaywall
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Copyright 2014 Elsevier B.V.