Development of gallium incorporated mesoporous silica catalysts for the selective removal of BTX

Authors:  Azhagapillai Prabhu, Ahmed Al Shoaibi, Chandrasekar Srinivasakannan

Abstract:
Three-dimensional mesoporous gallium KIT-6 with different Si/Ga molar ratios have been prepared by using P123 as a structure directing agent under acidic medium in hydrothermal conditions. The synthesized Ga-KIT-6 materials were characterized using small angle X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), nitrogen sorption analyzer, UV–visible diffuse reflectance spectroscopy (UV–vis DRS),X-ray fluorescence spectroscopy (XRF), Fourier transform infrared spectroscopy (FT-IR) and thermo gravimetric analysis (TGA). The developed mesoporous gallium KIT-6 material possesses a high surface area of 892 m² g⁻¹ and pore volume of 1.24 cm³ g⁻¹. The mesoporous structure of the catalyst together with the presence of gallium in the silica framework, which confers acidity for better adsorption. Adsorption of BTX over the different Si/Ga molar ratios of cubic Ia3d (GaKIT-6) materials were studied and found that the better adsorption on Ga-KIT-6 (5). Interestingly, this material showed excellent adsorption capacity of BTX in aqueous solution.

Keywords:
Mesoporous silica
Ga-KIT-6
Adsorption of BTX compounds
Surface acidity
Surface area

Published in: Applied catalysis A: General  (Volume 466, Pages 1-314, 10 September 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Development of gallium incorporated mesoporous silica catalysts for the selective removal of BTX

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