Mesoporous TiO 2 with anatase crystalline structure (MTiO 2 /CAS) has been synthesized by using chrome azurol S (CAS, 2 00 ,6 00 -dichloro-3,3 0 -dimethyl-4 0 -hydroxy-3 00 -sulfofuchson-5,5 0 -dicarboxylic acid) as template. It was characterized by X-ray diffraction, nitrogen adsorption/desorption, diffuse reflectance UV-visible and FT-IR spectrometry, and transmission electron microscopy. It was found that MTiO 2 /CAS had substantial photocatalytic activity in the degradation of methylthionine chloride, rhodamine B, gentian violet, safranin T, methyl violet, and fuchsine basic whereas Degussa P25 (P25) had negligible photodegradation yield (\6%) under visible light irradiation.
Cobalt doped porous titania-silica with Ti/Si molar ratio of 0.2 synthesized by using rice husks as both silicon source and template presented good product (4-pyridinecarboxylic acid) selectivity (91%) and high substrate conversion rate (96%) for the catalytic oxidation of 4-methyl pyridine. Fast hot catalyst filtration experiment proved that it acted as a heterogeneous one and can be used a number of times with almost the same activity.
Liquid phase oxidation of cyclohexene was carried out under mild reaction conditions over selenite doped MCM-41 using aqueous hydrogen peroxide as oxidant and acetic acid as solvent. The major products of the reaction were 2-acetoxycyclohexanol and a small amount of 1,2-cyclohexanediol. The catalyst exhibited very high substrate conversion (*100%) and good product (2-acetoxycyclohexanol) selectivity (81%) and it can be reused with almost the same activity. The catalyst was characterized by a combination of various physicochemical techniques, such as N 2 physisorption, TEM, X-ray diffraction and FT-IR.
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