Ciclohexanol

Páginas: 3 (531 palabras) Publicado: 7 de septiembre de 2011
Journal of Catalysis 262 (2009) 304–313

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Journal of Catalysis
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Cyclohexane oxidation catalyzed by manganese oxideoctahedral molecular sieves—Effect of acidity of the catalyst
Ranjit Kumar a , Shanthakumar Sithambaram a , Steven L. Suib a,b,c,∗
a b c

Department of Chemistry, University of Connecticut, U-3060, 55North Eagleville Rd., Storrs, CT 06269-3060, USA Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, CT 06269-3060, USAInstitute of Materials Science, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, CT 06269-3060, USA

a r t i c l e

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a b s t r a c t
Oxidation of cyclohexane is animportant industrial process, its oxidation products, cyclohexanol and cyclohexanone are raw materials for adipic acid and caprolactam synthesis. Acid exchanged cryptomelane type manganese oxideoctahedral molecular sieves (H-K-OMS-2) was used for liquid phase oxidation of cyclohexane with t-butyl hydroperoxide as an oxidant. The H+ form of K-OMS-2 was synthesized by ion-exchange of K-OMS-2 withconcentrated nitric acid. H-K-OMS-2 has been found to be an efficient catalyst for the oxidation of cyclohexane with a high conversion (∼60%). More than 90% selectivity for cyclohexanol and cyclohexanonewas obtained. A turn over number (TON) of 73 was obtained in 24 h at 80 ◦ C and if we consider only contributions of acidic manganese sites then the TON is 287. Effect of increase in number of acidsites of the K-OMS-2 was correlated with the increase in conversion. The reactions were carried out in a semi-batch reactor at 80 ◦ C using acetonitrile as solvent. Effects of solvent, temperature, andamount of t-butyl hydroperoxide on conversion and selectivity were studied. © 2009 Elsevier Inc. All rights reserved.

Article history: Received 17 October 2008 Revised 13 January 2009 Accepted 14...
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