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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7047

Title: Synthesis, characterization and catalytic properties of mesoporous TiHMA molecular sieves: selective oxidation of cycloalkanes
Authors: SELVAM, P
MOHAPATRA, SK
Keywords: cyclohexane oxidation
titanium silicate
hydrogen-peroxide
highly efficient
aluminophosphates
zeolite
complexes
epoxidation
alkanes
h2o2
Issue Date: 2004
Publisher: ELSEVIER SCIENCE BV
Citation: MICROPOROUS AND MESOPOROUS MATERIALS, 73(3), 137-149
Abstract: Titanium substituted hexagonal mesoporous aluminophosphate (TiHMA) molecular sieves were synthesized and characterized. Various physicochemical studies, viz., X-ray diffraction, transmission electron microscopy, electron diffraction, environmental scanning electron microscopy, thermal analyses, inductively coupled plasma-atomic emission spectroscopy, diffuse reflectance ultraviolet-visible spectroscopy, Fourier transform Raman spectroscopy, temperature programmed desorption of ammonia and nitrogen absorption-desorption isotherms, confirm the substitution of Ti4+ ions in the tetrahedral framework of HMA. The catalytic activity of TiHMA was evaluated for the oxidation reactions of cyclic saturated hydrocarbons such as cyclohexane, cyclooctane and cyclododecane. The catalyst exhibits excellent substrate conversion and product selectivity, and that it was found to be truly as a heterogeneous catalyst as the activity was practically unaffected upon recycling. In particular, the oxidation was highly successful for the bulkier cycloalkane molecules. Furthermore, the activity of TiHMA is also compared with mesoporous TiMCM-41 as well as microporous TiAPO-5 and TS-1 catalysts. (C) 2004
URI: http://dx.doi.org/10.1016/j.micromeso.2004.05.003
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7047
http://hdl.handle.net/10054/7047
ISSN: 1387-1811
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