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Title: t-Butylation of p-cresol with t-butyl alcohol over mesoporous Al-MCM-41 molecular sieves
Authors: Selvaraj, M.
Kawi, S. 
Keywords: Al-MCM-41
Brønsted acidity
Catalytic activity
Conversion of p-cresol
Selectivity of TBC
Issue Date: 5-Jan-2007
Citation: Selvaraj, M., Kawi, S. (2007-01-05). t-Butylation of p-cresol with t-butyl alcohol over mesoporous Al-MCM-41 molecular sieves. Microporous and Mesoporous Materials 98 (1-3) : 143-149. ScholarBank@NUS Repository.
Abstract: Selective liquid-phase t-butylation of p-cresol with t-butyl alcohol (t-BuOH) to produce 2-t-butyl-p-cresol (TBC) has been conducted over Al-MCM-41 catalysts with different Si/Al ratios. The effects of various reaction parameters such as temperature, reaction time and nt-BuOH:np-cresol ratio on the conversion of p-cresol and the selectivity of TBC have been systematically investigated as well. When the Si/Al ratio of Al-MCM-41 catalysts is increased from 21 to 104 (respectively yielding Al-MCM-41(21), Al-MCM-41(42), Al-MCM-41(62), Al-MCM-41(83) and Al-MCM-41(104)), both the conversion of p-cresol and the yield and selectivity of TBC decrease due to the decrease of the number of Brønsted acid sites of the Al-MCM-41 catalysts. Al-MCM-41(21) catalyst is found to give the highest conversion of p-cresol (88.2%) and the highest selectivity of TBC (90.40%) under the optimal nt-BuOH:np-cresol mole ratio of 2:1, the optimal reaction temperature of 90 °C and the optimal reaction time of 2 h. Furthermore, Al-MCM-41(21) can be recycled up to at least four times without losing its catalytic performance for butylation reaction. © 2006 Elsevier Inc. All rights reserved.
Source Title: Microporous and Mesoporous Materials
ISSN: 13871811
DOI: 10.1016/j.micromeso.2006.08.020
Appears in Collections:Staff Publications

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