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Thermally stable trivalent iron-substituted hexagonal mesoporous aluminophosphate (FeHMA) molecular sieves: Synthesis, characterization, and catalytic properties

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Title Thermally stable trivalent iron-substituted hexagonal mesoporous aluminophosphate (FeHMA) molecular sieves: Synthesis, characterization, and catalytic properties
 
Creator SELVAM, P
MOHAPATRA, SK
 
Subject cyclohexane oxidation
selective oxidation
heterogeneous catalysts
phenol hydroxylation
hydrogen-peroxide
containing mcm-41
highly efficient
liquid-phase
fe
reactivity
mesoporous
aluminophosphates
iron
fehma
oxidation
cycloalkanes
cyclohexane
cyclooctane
cyclododecane
 
Description Thermally stable trivalent iron-substituted hexagonal mesoporous aluminophosphate (FeHMA) molecular sieves were synthesized and systematically characterized using analytical and spectroscopic techniques, including XRD, TEM, ICP-AES, TGA-DTA, N-2 sorption, DRUV-vis, EPR, and Mossbauer spectroscopy. The characterization studies showed that framework substitution of trivalent iron in tetrahedral framework position of the mesoporous aluminophosphate has taken place. Mossbauer revealed the presence of a small amount of divalent iron. This material has high thermal stability with regard to the dislodgement of trivalent iron from the framework structure on calcination and showed excellent activity in the liquid-phase oxidation of cycloalkanes such as cyclohexane, cyclooctane, and cyclododecane in presence of molecular oxygen or air under mild reaction conditions. FeHMA behave as a heterogeneous catalyst; the catalytic activity was practically unaffected by recycling experiments. Furthermore, the oxidation was successful for the bulkier cycloalkane molecules. A comparative study with selected iron-containing molecular sieve-based catalysts indicated that FeHMA is a promising heterogeneous catalyst with respect to its microporous analogue (FeAPO-5) as well as the silicate analogues, microporous FeS-1 and mesoporous FeMCM-41. (c) 2005
 
Publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
 
Date 2011-07-12T17:15:50Z
2011-12-26T12:49:00Z
2011-12-27T05:34:37Z
2011-07-12T17:15:50Z
2011-12-26T12:49:00Z
2011-12-27T05:34:37Z
2006
 
Type Article
 
Identifier JOURNAL OF CATALYSIS, 238(1), 88-99
0021-9517
http://dx.doi.org/10.1016/j.jcat.2005.12.005
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3395
http://hdl.handle.net/10054/3395
 
Language en