@article { ISI:000254872600028,
	title = {Heteropoly acid encapsulated SBA-15/TiO(2) nanocomposites and their unusual performance in acid-catalysed organic transformations},
	journal = {Chemistry-A European Journal},
	volume = {14},
	number = {10},
	year = {2008},
	month = {FEB},
	pages = {3200-3212},
	publisher = {WILEY-BLACKWELL},
	type = {Article},
	address = {COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA},
	abstract = {<p>The preparation of SBA-15/TiO(2) nanocomposites with different loadings of Keggin-type 12-tungsto-phosphoric acid (TPA) nanocrystals in their mesochannels through a simple and effective vacuum impregnation method is reported for the first time. The catalysts have been characterised by various sophisticated techniques, including XRD, HRSEM, and TEM. It has been found that the acidity and the textural parameters of the nanocomposites can be controlled by simply changing the loadings of TPA and TiO(2) or the calcination temperature. TPA and TiO(2) loadings of 15 and 22.4 wt \%, respectively, and a calcination temperature of 1123 K have proved to be optimal for obtaining mesoporous nanocomposite materials with the highest acidity. Moreover, the activities of these catalysts in promoting hydroamination as well as Mannich and Claisen rearrangement reactions have been extensively investigated. The results show that the amount of TPA has a great influence on the activity of the nanocomposites in all of the reactions studied. The effects of other reaction parameters, such as temperature and reaction time, on the conversion and product selectivity have also been studied in detail. A kinetic analysis of the formation of the products under various reaction conditions is presented. It has been found that the activity of the nanocomposite composed of 15 wt \% TPA deposited on 22.4 wt of TiO(2) on SBA-15 in promoting the studied reaction is remarkably higher than the catalytic activities shown by pure TPA, TiO(2)-loaded SBA-15, or TPA-loaded SBA-15. The results obtained have indicated that the acidity and the structural control of the nanocomposite materials are highly critical for obtaining excellent catalytic activity, and the presented highly acidic nanocomposites are considered to show great potential for use as catalysts in promoting many acid-catalysed organic transformations.</p>},
	keywords = {Bronsted acids, mesoporous materials, nanoreactors, nanotechnology, supported catalysts},
	issn = {0947-6539},
	doi = {10.1002/chem.200701562},
	author = {Sawant, Dhanashri P. and Justus, Josena and Balasubramanian, Veerappan V. and Ariga, Katsuhiko and Srinivasu, Pavuluri and Velmathi, Sivan and Halligudi, Shivappa B. and Vinu, Ajayan}
}
@article { ISI:000254979800027,
	title = {Highly efficient and chemo selective catalyst system for the synthesis of blossom orange fragrance and flavoring compounds},
	journal = {Catalysis Communications},
	volume = {9},
	number = {7},
	year = {2008},
	month = {APR},
	pages = {1671-1675},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>{Acetal and acylal formation reactions of organic compounds are efficiently catalyzed by zirconia-supported mixed oxide systems under liquid-phase reaction conditions. 15WZ-750 (where</p>},
	keywords = {Acetal, acylal, Silicotungstic acid, tungsten oxide, tungstophosphoric acid, Zirconia},
	issn = {1566-7367},
	doi = {10.1016/j.catcom.2008.01.025},
	author = {Justus, Josena and Vinu, Ajayan and Devassy, Biju M. and Balasubramanian, Veerappan V. and Bohringer, Walter and Fletcher, Jack C. Q. and Halligudi, Shivaraj B.}
}
