Direct synthesis of well-ordered mesoporous Al-SBA-15 and its correlation with the catalytic activity

  • Bhange P
  • Bhange D
  • Pradhan S
 et al. 
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Abstract

The synthesis of Al-SBA-15 under milder acidic conditions were made through an adjusting the molar H2O/HCl ratio which indicate the formation of Si-O-Al linkages that lead to isomorphous substitution of Si4+by some Al3+ions. By adjusting the H2O/HCl molar ratio, Al gets incorporated into the lattice of SBA-15, which is evidenced by XRD, N2adsorption, TEM,29Si and27Al MAS NMR spectroscopic data. Aluminium incorporated SBA-15 samples retained both structural and textural properties of SBA-15. The27Al MAS NMR confirms that a large proportion of the Al is inserted into tetrahedral positions within the framework. The Al3+ions could assume a tetrahedral coordination and be part of the hexagonal structure of silica in Al-SBA-15. In the present study, we have examined the effectiveness of Al-SBA-15, as an acid catalyst for the esterification of acetic acid and in benzylation of anisole. The high activity of Al-20 sample in esterification reaction has been attributed to isolated, generally tetrahedrally coordinated, framework Al species. While in benzylation of anisole, the best result was achieved with Al-5 catalyst. The selectivity for benzylanisole increases and that for dibenzylether decreases with increase in the Si/Al ratio of Al-SBA-15. © 2011 Elsevier B.V.

Author-supplied keywords

  • Al-SBA-15
  • Benzylation of anisole
  • Esterification of acetic acid

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Authors

  • Pallavi Bhange

  • Deu S. Bhange

  • Sivaram Pradhan

  • Veda Ramaswamy

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