Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.micromeso.2007.05.053
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dc.titleComparison of mesoporous and microporous solid acid catalysts for highly selective synthesis of thymol by vapor phase isopropylation of m-cresol
dc.contributor.authorSelvaraj, M.
dc.contributor.authorKawi, S.
dc.date.accessioned2014-10-09T06:45:01Z
dc.date.available2014-10-09T06:45:01Z
dc.date.issued2008-03-01
dc.identifier.citationSelvaraj, M., Kawi, S. (2008-03-01). Comparison of mesoporous and microporous solid acid catalysts for highly selective synthesis of thymol by vapor phase isopropylation of m-cresol. Microporous and Mesoporous Materials 109 (1-3) : 458-469. ScholarBank@NUS Repository. https://doi.org/10.1016/j.micromeso.2007.05.053
dc.identifier.issn13871811
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/88674
dc.description.abstractIsopropylation of m-cresol with isopropyl alcohol (IA) as an alkylating agent has been conducted under vapor phase reaction conditions over mesoporous Zn-Al-MCM-41 catalysts with different nSi/(nZn + nAl) ratios for highly selective synthesis of thymol. The influence of reaction parameters such as reaction temperature, WHSV, mole ratio of reactants, time-on-stream and recyclability reactions, have also been investigated. With increasing the nSi/(nZn + nAl) ratios of Zn-Al-MCM-41 catalysts from 75 to 380, conversion of m-cresol and yield as well as selectivity of thymol decrease because the number of Brønsted acid sites in Zn-Al-MCM-41 catalysts are found to decrease almost linearly with increasing ratios of nSi/(nZn + nAl) from 75 to 380. The conversion of m-cresol and selectivity of thymol in Zn-Al-MCM-41(75) remain constant with each cycling of reaction because of no loss of catalytic activity on the inner side surface of pore walls. Furthermore, these catalytic results are compared with those obtained by using Al-MCM-41(with different nSi/nAl ratio = 21, 42 and 104), HY, Hβ, HM and H-ZSM-5 zeolites. Based on the comparison of catalytic results, Zn-Al-MCM-41(75) is found to be a highly active and recyclable heterogeneous catalyst for the highly selective synthesis of thymol. © 2007 Elsevier Inc. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.micromeso.2007.05.053
dc.sourceScopus
dc.subjectAcidity
dc.subjectCatalytic activity
dc.subjectConversion of m-cresol
dc.subjectRecyclability
dc.subjectSelectivity of thymol
dc.subjectSynthesis of solid acid catalysts
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.description.doi10.1016/j.micromeso.2007.05.053
dc.description.sourcetitleMicroporous and Mesoporous Materials
dc.description.volume109
dc.description.issue1-3
dc.description.page458-469
dc.description.codenMIMMF
dc.identifier.isiut000252869300051
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