Preparation of heterogeneous vanadium (VO2+) catalyst for selective hydroxylation of cyclohexane by molecular oxygen

A vanadium(II) Schiff base ligand, [1,4-bis (salicylidene amino)-phenylene] vanadium oxo complex bonded on carbamate-modified silica gel, has been synthesized. The liquid-phase oxidation reaction of cyclohexane with this catalyst was found to give cyclohexanol at moderate condition (reaction tempera...

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Bibliographic Details
Published in:Catalysis letters 2002-07, Vol.81 (1-2), p.113-117
Main Authors: MISHRA, G. S, KUMAR, A
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic reactions
Chemistry
Cyclohexane
Cyclohexanone
Exact sciences and technology
General and physical chemistry
Hydroxylation
Imines
Leaching
Liquid phase oxidation
Oxygen
Reaction time
Silica gel
Silicon dioxide
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Vanadium
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Summary:A vanadium(II) Schiff base ligand, [1,4-bis (salicylidene amino)-phenylene] vanadium oxo complex bonded on carbamate-modified silica gel, has been synthesized. The liquid-phase oxidation reaction of cyclohexane with this catalyst was found to give cyclohexanol at moderate condition (reaction temperature 200 °C, pressure 23.8 atm, catalyst concentration 1.0% and 16 h of reaction time) with considerably higher specificity (18:1 ratio with cyclohexanone and negligible acid formation). The catalyst has been tested for 200 h of reaction and the leaching of the metal occurs negligibly.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1016076526549