期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 274, 期 1-2, 页码 192-201出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2007.05.018
关键词
zeolite encapsulated complexes; catalysts; vanadium complexes; copper complexes; nickel complexes; oxidation of styrene; oxidation of methyl; phenyl sulfide; oxidation of cyclohexane
Oxovanadium(IV), copper(II) and nickel(II) complexes of Schiff base derived from salicylaldehyde and o-aminobenzyl alcohol (H(2)sal-oaba) have been encapsulated in the nano-pores of zeolite-Y by flexible ligand method and characterised by metal analysis, spectroscopic (IR and electronic) studies, scanning electron micrographs, thermal analysis and X-ray diffraction patterns. The encapsulated complexes abbreviated here as [VO(sal-oaba)(H2O)-Y, [Cu(sal-oaba)(H2O)]-Y and [Ni(sal-oaba)(H2O)(3)]-Y catalyse the oxidation of styrene, cyclohexane and methyl phenyl sulfide using H2O as oxidant in good yield. Styrene catalysed by [VO(sal-oaba)(H2O)]-Y, [Cu(sal-oaba)(H2O)]-Y under optimised reaction conditions gave five reaction products namely, styrene oxide, benzaldehyde, I -phenylethane- 1,2-diol, benzoic acid and phenylacetaldehyde, while [Ni(sal-oaba)(H2O)(3)]-Y gave benzaidehyde selectively. In the presence of tert-butylhydroperoxide all catalysts gave styrene oxide in major yield, though overall conversion has been found low (10-30%). The oxidation products of cyclohexane are cyclohexanone and cyclohexanol. A maximum of 93.2% conversion of methyl phenyl sulfide has been achieved with [VO(sal-oaba)(H2O)]-Y Using H2O2 as oxidant, where selectivity of sulfoxide was 96.9%. Other catalysts were inactive towards the oxidation of methyl phenyl sulfide while neat complex [VO(sal-oaba)] has been found to be equally active. (C) 2007 Elsevier B.V. All rights reserved.
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