Catalysis Database

Synthesis and characterization of a crystalline vanadium silicate with MEL structure

P R, Hari Prasad Rao and Rajiv, Kumar and A.V., Ramaswamy and P. , Ratnasamy (1993) Synthesis and characterization of a crystalline vanadium silicate with MEL structure. Zeolites, 13 . pp. 63-70.

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Abstract

Synthesis of a novel crystalline vanadium silicate having the MEL structure (silicalite-2) is reported. Tetraethyl orthosilicate and vanadyl sulfate were the raw materials and tetrabutylammonium hydroxide was the additive. The influence of various synthesis parameters such as the SiN molar ratio, concentration of the organic base, and dilution levels on the crystallization of vanadium silicate has been investigated. The kinetics of crystallization has been followed using X-ray powder diffraction, SEM, framework i.r., and e.s.r, spectroscopic techniques. Under optimum conditions of synthesis, vanadium is incorporated as V 4+ in a progressive manner in the MEL framework during the crystallization process. After calcination in air at 773 K, most of the vanadium (as V s+) is still intact within the silicalite structure.

Item Type:Article
Subjects:Science > Chemistry
ID Code:489
Deposited By:INVALID USER
Deposited On:27 Mar 2007 20:04
Last Modified:27 Mar 2007 20:04

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