Synthesis and characterization of acidic properties of Al-SBA-15 materials with varying Si/Al ratios |
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Authors: | G. Muthu Kumaran Shelu Garg Kapil Soni Manoj Kumar J.K. Gupta L.D. Sharma K.S. Rama Rao G. Murali Dhar |
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Affiliation: | aIndian Institute of Petroleum, Catalytic Conversion Processes Division, Haridwar road, Uttranchal, Mohkampur, Dehradun 248 005, India;bIndian Institute of Chemical Technology, Hyderabad 400 007, India |
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Abstract: | Al-SBA-15 of varying Si/Al ratios in the range 11.4–78.4 was synthesized using tri-block copolymer P123. The calcined materials were examined by XRD, pore size distribution, surface area, 27Al NMR spectroscopy. The acidity and acid strength distribution were studied using microcalorimetric adsorption of NH3. The acidic properties were also examined by cumene cracking reaction as a function of Si/Al ratios. Systematic variation of acidity and activity was observed as a function of Si/Al ratio. The initial heats of NH3 adsorption correlated well with activity indicate that acid sites with ΔH > 100 kJ/mole is responsible for cumene cracking activity. Linear correlations were obtained with total acidity and cumene cracking activities. The tetrahedral aluminum was found to be responsible for the observed acidities and catalytic activities. |
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Keywords: | Al-SBA-15 Mesoporous materials Acidity and acid strength distributions Microcalorimetry Cumene cracking |
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