%0 Journal Article %J Journal of Molecular Catalysis A-Chemical %D 2007 %T Butylation of toluene: influence of zeolite structure and acidity on 4-tert-butyltoluene selectivity %A Pai, Shivanand %A Gupta, Upendranath %A Chilukuri, Satyanarayana V. %K 4-t-butyltoluene %K Acidity %K butylation %K large pore zeolites %K Toluene %X

Vapour phase alkylation of toluene with tert-butyl alcohol was studied over the large pore zeolites H beta, HY and HMCM-22. The influence of the acidity, reaction temperature, run duration, feed rate (WHSV) and molar ratio of the reactants on conversion of toluene and selectivity for 4-tertbutyl toluene was studied. Among the isomers formed during the reaction, the para-isomer was the predominant one, followed by the meta-isomer, while no ortho-isomer was found in the products due to steric factors. 4-tert-Butyl toluene selectivity decreases at higher temperatures, while going through a maximum in the 413-433 K temperature range. Zeolite HY with a high silica to alumina ratio (SiO2/Al2O3 = 80), that has strong acidity, but lower acid site density, possesses high activity for toluene conversion, high alkylation selectivity and also high para-selectivity. The improved para-selectivity of high silica HY zeolite is attributed to the low isomerization activity that results in the suppression of the secondary isomerization of 4-tert-butyl toluene. Both alkylation and selectivity are higher with feed mixtures containing a lower fraction of tert-butyl alcohol. (c) 2006 Elsevier B.V. All rights reserved.

%B Journal of Molecular Catalysis A-Chemical %I ELSEVIER SCIENCE BV %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %V 265 %P 109-116 %8 MAR %G eng %N 1-2 %9 Article %3 Foreign %4 3.958 %R 10.1016/j.molcata.2006.09.046