Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.cattod.2007.10.046
Title: Direct synthesis and catalytic performance of ultralarge pore GaSBA-15 mesoporous molecular sieves with high gallium content
Authors: Selvaraj, M.
Kawi, S. 
Keywords: Conversion of DHB
Direct hydrothermal synthesis
GaSBA-15
pH-adjusting method
Selectivity of 4-TBC
t-Butylation of DHB
Issue Date: 29-Feb-2008
Citation: Selvaraj, M., Kawi, S. (2008-02-29). Direct synthesis and catalytic performance of ultralarge pore GaSBA-15 mesoporous molecular sieves with high gallium content. Catalysis Today 131 (1-4) : 82-89. ScholarBank@NUS Repository. https://doi.org/10.1016/j.cattod.2007.10.046
Abstract: Mesoporous GaSBA-15 molecular sieves with different nSi/nGa ratios have been directly synthesized using Pluronic 123 triblock polymer as a structure-directing agent by pH-adjusting method. The mesoporous materials have been characterized using ICP-AES, XRD, N2 adsorption, 71Ga-MAS NMR, SEM and TEM. ICP-AES studies show a high amount of gallium incorporation on the silica pore walls. The structural and textural properties of calcined GaSBA-15 are characterized by XRD and N2 adsorption. 71Ga MAS NMR results demonstrate that a high amount of tetrahedral-gallium could be substituted for Si in the framework of SBA-15. TEM and FE-SEM images show the uniform pore diameter and rope-like hexagonal mesoporous structure of GaSBA-15. These GaSBA-15 materials have been used as catalysts for vapour-phase t-butylation of 1,2-dihydroxybenzene (DHB) for selective synthesis of 4-t-butylcatechol (4-TBC) under different reaction conditions. GaSBA-15(10) gave the highest 93.2% conversion of DHB and 95.7% selectivity of 4-TBC as compared with other GaSBA-15 catalysts. © 2007.
Source Title: Catalysis Today
URI: http://scholarbank.nus.edu.sg/handle/10635/88766
ISSN: 09205861
DOI: 10.1016/j.cattod.2007.10.046
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