NDLI: Selective oxidation of cyclohexane in compressed CO<sub>2</sub> and in liquid solvents over MnAPO-5 molecular sieve

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Selective oxidation of cyclohexane in compressed CO₂ and in liquid solvents over MnAPO-5 molecular sieve

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Zhimin Han, Buxing Gao, Liang Hou, Zhenshan Yang, Guanying
Copyright Year	2002
Abstract	The selective oxidation reaction of cyclohexane with MnAPO-5 molecular sieve catalyst to produce cyclohexanol and cyclohexanone was carried out in compressed CO2 at 398.2 K using oxygen as an oxidant, and the reaction mixture was controlled to be in the two-phase region, very close to the critical point, and in the supercritical (sc) region of the reaction system. The effect of a small amount of butyric acid cosolvent on the reaction in scCO2 was also studied. The reaction was also conducted in liquid butyric acid, benzene and CCl4, and in the absence of any solvent. It has been observed that the conversion and selectivity of the reaction in compressed CO2 change considerably with the phase behavior or the apparent density of the reaction system. Addition of a small amount (0.2 mol%) of butyric acid cosolvent to scCO2 enhances the conversion significantly, and the selectivity also changes considerably. The by-products of the reaction in compressed CO2 with and without the cosolvent are much less than that of the reaction in liquid solvents or in the absence of solvents. It is advantageous to conduct the reaction in supercritical CO2.
Starting Page	426
Ending Page	430
Page Count	5
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	4
Issue Number	5
Journal	Green Chemistry
DOI	10.1039/b200428n
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cyclohexane Molecular sieve Cyclohexanol Cyclohexanone Oxygen Calculus of variations Supercritical carbon dioxide Acid Benzene Solvent
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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