Catalysis Database

Synthesis, characterization and catalytic properties of mesoporous TiHMA molecular sieves: selective oxidation of cycloalkanes

P, Selvam and Susanta K., Mohapatra (2004) Synthesis, characterization and catalytic properties of mesoporous TiHMA molecular sieves: selective oxidation of cycloalkanes. Microporous and Mesoporous Materials , 73 . pp. 137-149.

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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.

Item Type:Article
Subjects:Science > Chemistry
ID Code:258
Deposited By:INVALID USER
Deposited On:28 Feb 2007 19:09
Last Modified:04 Mar 2007 11:22

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