@conference { ISI:000230895600102,
	title = {Immobilized molybdovanadophosphoric acids on SBA-15 for selective oxidation of alkenes},
	booktitle = {4th International Symposium on Nanoporous Materials},
	series = {STUDIES IN SURFACE SCIENCE AND CATALYSIS},
	volume = {156},
	year = {2005},
	note = {4th International Symposium on Nanoporous Materials, Niagara Falls, CANADA, JUN 07-10, 2005},
	month = {JUN},
	pages = {769-778},
	publisher = {Elsevier Science BV, Sara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, Netherlands},
	organization = {Elsevier Science BV, Sara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, Netherlands},
	address = { Niagara Falls, Canada},
	abstract = {<p>Vanadium substituted molybdophosphoric acids have been immobilized on amine functionalized SBA-15 and characterized by different techniques. Small angle X-ray scattering analysis and SEM technique provide evidence for the structural integrity of the samples. UV-Vis, NMR and IR data confirm the incorporation of molybdovanadophosphoric acids onto the amine functionalized SBA-15. The textural properties of these materials were studied by nitrogen sorption studies. Oxidation of cyclooctene and norbornene was carried out with oxidants in aqueous (aq. H2O2) and non-aqueous (TBHP extracted in dichloroethane) medium. The reactions were carried out with both the neat catalysts (homogeneous) and the immobilized catalysts (heterogenized) and the results were compared. The selectivity of the desired products was always \&gt; 99\% with the immobilized catalyst with both aq.H2O2 and TBHP. However, while the leaching was negligible in the non-aqueous medium, the aqueous medium leads to considerable leaching. The immobilized catalysts could be separated after the reaction and the reusability of the catalyst has also been demonstrated especially with oxidant in the nonaqueous medium.</p>},
	isbn = {0-444-51748-0},
	issn = {0167-2991},
	author = {Raj, N. K. K. and Deshpande, S. S. and Ingle, Rohit H. and Raja, T. and Manikandan, Palanichamy},
	editor = {Sayari, A. and Jaroniec, M.}
}
@article { ISI:000272560400015,
	title = {Immobilization of phosphotungstic acid (PTA) on imidazole functionalized silica: evidence for the nature of PTA binding by solid state NMR and reaction studies},
	journal = {Journal of Physical Chemistry C},
	volume = {113},
	number = {50},
	year = {2009},
	month = {DEC},
	pages = {21114-21122},
	publisher = {AMER CHEMICAL SOC},
	address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
	abstract = {<p>Phosphotungstic acid (PTA) immobilized onto imidazole functionalized fumed silica and was used its an efficient catalyst for epoxidation of a variety of olefins using aqueous H(2)O(2) as all oxidant. Negligible leaching of PTA under the reaction conditions employed indicates a strong interaction between PTA and imidazole The immobilized catalysts Could be separated and reused after the catalytic cycle Evidence for the heterogenization of PTA oil the imidazole functionalized fumed silica has been inferred from different spectroscopic techniques like IR, UV-vis, and NMR. Importantly, the nature of binding of PTA oil the support has been studied in detail by solid state NMR spectroscopy using (15)N labeled imidazole Support. It is clear from the NMR Studies that the effective heterogenization of PTA is mainly due to imidazolium ion Formation oil the support by the acidic protons of PTA and the resultant ion pair</p>},
	issn = {1932-7447},
	doi = {10.1021/jp906108e},
	author = {Sofia, L. T. Aany and Krishnan, Asha and Sankar, M. and Raj, N. K. Kala and Manikandan, Palanichamy and Rajamohanan, P. R. and Ajithkumar, Thalasseril G.}
}
