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Title: Synthesis and characterization of Al-HMS catalysts and their application for t-butylation of toluene
Authors: Yu, Weihua
Zhou, Chunhui
Lü, Deyi
Zhang, Bo
Xu, Xiangsheng
Issue Date: Feb-2008
Publisher: CSIR
IPC CodeInt. Cl. ⁸ B01J21/00; B01J37/00
Abstract: Al-HMS (hexagonal mesoporous silica) with Al content in the range 2 - 10 mol% has been synthesized using dodecylamine surfactant as template and aluminum s-butoxide as the aluminum source. The mesoporous structure has been confirmed by XRD and the surface area and pore size calculated by BET equation and BJH method using nitrogen adsorption-desorption technique. The aluminum atom coordination has been determined by ²⁷Al MAS NMR. The total acidity and the type of acid sites have been studied using TPD of chemisorbed 2,6-di-tert-butylpyridine and IR spectra of pyridine adsorption, respectively. The Al-HMS materials possess abundant tetrahedral aluminum in the HMS framework and also BrÖnsted and Lewis acid sites. The catalytic activities of the materials have been tested in 4-t-butylation reaction of toluene in liquid phase. Maximum conversion (85.1%) of toluene has been achieved with 10%Al-HMS catalyst, and high selectivity (> 80%) for 4-t-butyltoluene is observed over 2 - 4.8% Al-HMS catalysts. The conversion of toluene increases with increase of Al content, and the selectivity of 4-t-butyltoluene decreases to 70% when Al content is increased up to 10% in HMS materials.
Page(s): 181-185
ISSN: 0376-4710
Source:IJC-A Vol.47A(02) [February 2008]

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