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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3393

Title: Synthesis and characterization of divalent cobalt-substituted mesoporous aluminophosphate molecular sieves and their application as novel heterogeneous catalysts for the oxidation of cycloalkanes
Authors: SELVAM, P
MOHAPATRA, SK
Keywords: liquid-phase oxidation
electron-spin-resonance
selective oxidation
cyclohexane oxidation
redox centers
mesostructured aluminophosphates
hydrogen-peroxide
adipic acid
zeolite
phosphate
Issue Date: 2005
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation: JOURNAL OF CATALYSIS, 233(2), 276-287
Abstract: Thermally stable divalent cobalt-substituted hexagonal mesoporous aluminophosphate, CoHMA molecular sieves were hydrothermally synthesized and systematically characterized by several analytical and spectroscopic techniques. XRD, TEM, ED, ICP-AES, TGA-DTA, N-2 sorption, DR-UV-vis, XANES, and NH3-TPD studies showed isomorphous substitution of divalent cobalt in a tetrahedral framework of a mesoporous aluminophosphate matrix. Furthermore, the blue color of CoHMA, before and after thermal treatment, further confirmed the tetrahedral environment of divalent cobalt in the matrix. As a result, the CoHMA catalyst showed excellent activity for the oxidation of cycloalkanes, that is, cyclohexane, cyclooctane and cyclododecane, under mild reaction conditions. Unlike the many other cobalt-based heterogeneous catalysts reported so far, CoHMA does not show any dislodgement or segregation of cobalt with calcination or any other postsynthesis treatments. In this study, the performance of CoHMA was also compared with the cobalt-containing microporous aluminophosphate, that is, CoAPO-5 with AFI topology, as well as with both microporous and mesoporous analogues of cobalt silicate molecular sieves that have MFI or MCM-41 structures. (c) 2005
URI: http://dx.doi.org/10.1016/j.jcat.2005.04.036
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3393
http://hdl.handle.net/10054/3393
ISSN: 0021-9517
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