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|Title:||Synthesis and characterization of Al-HMS catalysts and their application for t-butylation of toluene|
|IPC Code:||Int. 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.|
|Appears in Collections:||IJC-A Vol.47A(02) [February 2008]|
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|IJCA 47A(2) (2008) 181-185.pdf||349.98 kB||Adobe PDF||View/Open|
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