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

被引:65
作者
Bhange, Pallavi [1 ]
Bhange, Deu S. [1 ,2 ]
Pradhan, Sivaram [1 ,3 ]
Ramaswamy, Veda [4 ]
机构
[1] Natl Chem Lab, Catalysis Div, Pune 411008, Maharashtra, India
[2] Shivaji Univ, Dept Chem, Kolhapur 416004, Maharashtra, India
[3] Univ Liverpool, Dept Chem, Liverpool L69 3BX, Merseyside, England
[4] Cent Leather Res Inst, Chem Phys Lab, Madras 600020, Tamil Nadu, India
关键词
Al-SBA-15; Esterification of acetic acid; Benzylation of anisole; PHASE ESTERIFICATION; CARBOXYLIC-ACIDS; MOLECULAR-SIEVES; ION-EXCHANGE; ACETIC-ACID; SBA-15; SILICA; ZEOLITES; ANISOLE; COPOLYMER;
D O I
10.1016/j.apcata.2011.04.031
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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. N-2 adsorption, TEM, Si-29 and Al-27 MAS NMR spectroscopic data. Aluminium incorporated SBA-15 samples retained both structural and textural properties of SBA-15. The Al-27 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. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:176 / 184
页数:9
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