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Silicate intercalated CoAl hydrotalcite materials were synthesized (CoAl-HT-Si) and systematically characterized. The intercalated hydrotalcite materials lead to the formation of solid solutions of cobalt silicate and cobalt spinel structures, which have higher surface area and pore volume than pure CoAl-HT. The XPS studies revealed the presence of cobalt in divalent and trivalent oxidation states on the surface. The resultant materials were found to be promising catalysts for oxidation of various alcohols. Experimental sectionHydrotalcite (HT) with a Co-Al molar ratio 3 : 1 was synthesized according to a method previously described in the literature. 24 Scheme 1 Schematic representation of intercalation on HT.

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A simple route has been established for grafting molybdenum carbonyl onto the surface of a diaminosilanemodified SBA-15 molecular sieve. The successful grafting of the molybdenum carbonyl species onto diaminefunctionalized SBA-15 was evident from FT-IR studies. The resultant molybdenum-carbonyl-complex-grafted SBA-15 (SBA-DA-Mo) materials show promising activity for the epoxidation of various olefins with good conversion (90-95%) and the formation of epoxide as the major product. The catalytic activity remains constant over several runs.Scheme 1 Schematic representation of the grafting of molybdenum carbonyl onto SBA-15 molecular sieve.