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|Title: ||Allylic oxidation of cyclohexene over chromium containing mesoporous molecular sieves|
|Authors: ||SAKTHIVEL, A|
|Keywords: ||liquid-phase oxidations|
|Issue Date: ||2003|
|Publisher: ||ELSEVIER SCIENCE BV|
|Citation: ||APPLIED CATALYSIS A-GENERAL, 246(2), 283-293|
|Abstract: ||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 .|
|Appears in Collections:||Article|
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