Allylic oxidation of cyclohexene over chromium containing mesoporous molecular sieves
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Title |
Allylic oxidation of cyclohexene over chromium containing mesoporous molecular sieves
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Creator |
SAKTHIVEL, A
DAPURKAR, SE SELVAM, P |
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Subject |
liquid-phase oxidations
selective oxidation heterogeneous catalysts polymerization catalyst silica (cr)mcm-41 alkylaromatics chemistry alcohols crapo-5 mesoporous molecular sieves (cr)mcm-41 (cr)mcm-48 allylic oxidation cyclohexene 2-cyclohexen-1-one |
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Description |
Allylic oxidation of cyclohexene was carried out over mesoporous (Cr)MCM-41 and (Cr)MCM-48 molecular sieve catalysts. In both the cases, 2-cyclohexen-1-one was obtained as the major product with small amounts of cyclohexene oxide and 1.2-cyclohexandiol. (Cr)MCM-48 showed higher activity than (Cr)MCM-41 owing to the high chromium content in the former. The use of polar solvents such as acetonitrile and methanol decrease the 2-cyclohexen-1-one selectivity; however, such a procedure produces double bond oxidized product, viz. cyclohexene oxide. Furthermore, unlike many other chromium-based solid catalysts, the activity over recycled as well as washed (Cr)MCM-41 and (Cr)MCM-48 remains nearly the same, indicating that the mesoporous chromosilicate materials behave truly as heterogeneous catalysts. In other words, after the initial loss of non-framework chromium ions for the first time, no leaching was noticed for the chromium-based systems. (C) 2003 .
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Publisher |
ELSEVIER SCIENCE BV
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Date |
2011-07-24T08:32:45Z
2011-12-26T12:47:31Z 2011-12-27T05:35:50Z 2011-07-24T08:32:45Z 2011-12-26T12:47:31Z 2011-12-27T05:35:50Z 2003 |
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Type |
Article
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Identifier |
APPLIED CATALYSIS A-GENERAL, 246(2), 283-293
0926-860X http://dx.doi.org/10.1016/S0926-860X(03)00051-6 http://dspace.library.iitb.ac.in/xmlui/handle/10054/6369 http://hdl.handle.net/10054/6369 |
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Language |
en
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