@article { ISI:000250399300023,
	title = {Spectroscopic and catalytic properties of SBA-15 molecular sieves functionalized with acidic and basic moieties},
	journal = {Microporous and Mesoporous Materials},
	volume = {105},
	number = {1-2},
	year = {2007},
	month = {SEP},
	pages = {170-180},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>SBA-15, grafted with Lewis acidic Ti4+ ions and basic amines (imidazole, guanine or adenine) exhibited high catalytic activity in the cycloaddition of CO2 to epoxides yielding selectively cyclic carbonate precursors of polycarbonates. In the second class of materials, the surface of SBA-15 was grafted with thiol or sulfonic acid functionalities. Mn(Salen)Cl was, then, covalently bound to these acidic groups. The resulting catalysts show enhanced chemo-, regio- and stereo-selective catalytic activity in the epoxidation of terpenes such as R-(+)limonene, alpha-pinene and Delta-carene with molecular oxygen. The acid-base properties of these modified SBA- 15 materials were investigated by temperature-programmed desorption and diffuse-reflectance infrared Fourier transform spectroscopy. Ammonia and pyridine were used as probe molecules for acidic sites and CO2 for basic sites. Acidic Ti sites activated epoxides and the grafted basic amines activated CO2. The simultaneous presence of both acidic and basic sites on amine/adenine-functionalized Ti-SBA-15 enabled synergistic enhancement in catalytic activity in the cycloaddition reaction of CO2 to epoxides. When Mn(Salen)Cl was immobilized on thiol or sulfonic acid-functionalized SBA-15, the oxidation state of Mn decreased from +3 to +2. The organo-acidic functional groups (thiol or sulfonic acid) axialk, coordinated to Mn ions modified the electronic structure of Mn ions enhancing the activity and selectivity of Mn(Salen) complexes in aerial oxidation reactions. (C) 2007 Elsevier Inc. All rights reserved.</p>},
	keywords = {aerial oxidation of terpenes, CO2 utilization, cyclic carbonates synthesis, epoxidation, functionalization with acidic and basic moieties, immobilization of Mn complexes, organo-functionalization of SBA-15, solid acid-base catalysts},
	issn = {1387-1811},
	doi = {10.1016/j.micromeso.2007.05.024},
	author = {Srinivas, D. and Ratnasamy, P.}
}
@article { ISI:000293492300025,
	title = {Selective epoxidation of methyl soyate over alumina-supported group VI metal oxide catalysts},
	journal = {Applied Catalysis A-General},
	volume = {401},
	number = {1-2},
	year = {2011},
	month = {JUL},
	pages = {189-198},
	publisher = {ELSEVIER SCIENCE BV},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>Epoxidation of methyl soyate (biodiesel), soybean oil and oleic acid with tert.-butyl hydroperoxide (TBHP) was investigated over gamma-alumina-supported group VI metal oxides (CrOx/Al2O3, MoOx/Al2O3 and WOx/Al2O3) prepared by impregnation method. The studies revealed that 15 wt\% MoOx on gamma-Al2O3 was the most active catalyst (conversion \&gt;90 mol\% under optimized conditions). While MoOx/Al2O3 is selective mainly for epoxidation, the other catalysts are active for epoxidation as well as for decomposition of TBHP. The active species on the catalyst surface were investigated using in situ UV-visible spectroscopy. A linear correlation was observed between epoxidation activity and surface acidity of the catalyst. A new H-1 NMR method was developed to monitor the progress of epoxidation reaction which was found to be superior to gas chromatographic method in estimating the conversion of double bonds of fatty compounds. (C) 2011 Elsevier B.V. All rights reserved.</p>},
	keywords = {Alumina-supported group VI metal oxides, Biodiesel, epoxidation, Fatty acids, H-1 NMR spectroscopy, MoOx/Al2O3, Vegetable oil},
	issn = {0926-860X},
	doi = {10.1016/j.apcata.2011.05.021},
	author = {Satyarthi, Jitendra K. and Srinivas, D.}
}
