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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.61  Durban  2008

 

RESEARCH ARTICLE

 

Synthesis, characterization and activity of sulphate-modified V2O5/SnO2 catalysts

 

 

Sreejarani K. Pillai; Omanakutty Gheevarghese*

Department of Chemistry, Tshwane University of Technology, Pretoria 0001, South Africa

 

 


ABSTRACT

Sulphate-modified V2O5/SnO2 catalysts were prepared by a simple impregnation method and characterized using different physicochemical techniques, such as EDX, BET-SA, XRD, FT-IR, TGA and 51V NMR spectroscopy. A simple, effective and environmentally friendly method for the gas phase conversion of cyclohexanone oxime to E-caprolactam by these modified catalysts is presented. The optimal protocol allows ε-caprolactam to be synthesized in excellent yields. NH3-TPD and cumene conversion reactions were used to determine the acid structural properties of the catalysts. Definite correlation was observed between the concentration of medium strength acid sites or Bronsted sites and the E-caprolactam selectivity. Time-on-stream studies showed fast decline in the activity of the catalyst resulting from the basic nature of the reactant and product molecules.

Keywords: Sulphated V2O5/SnO2 catalysts, acidity, vapour phase Beckmann rearrangement


 

 

Full text available only in pdf format.

 

 

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Received 19 July 2007
Revised 8 February 2008
Accepted 13 February 2008

 

 

* To whom correspondence should be addressed: E-mail: gheevargheseo@tut.ac.za

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