Article Sidebar
Published:
Oct 6, 2015Keywords:
Article Details
Copyright for articles published in this journal is retained by the journal.
SAJChem applies the Creative Commons Attribution (CC BY) license to manuscripts we publish. This license was developed to facilitate open access – namely, free immediate access to, and unrestricted reuse of, original works of all types. Under this license, authors agree to make articles legally available for reuse, without permission or fees, for virtually any purpose. Anyone may copy, distribute or reuse these articles, as long as the author and original source are properly cited.
Main Article Content
Synthesis, Characterization and Activity of Sulphate-modified V<sub>2</sub>O<sub>5</sub>/SnO<sub>2</sub> Catalysts
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 ε-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 Brønsted sites and the ε-caprolactam selectivity. Time-on-stream studies showed fast decline in the activity of the catalyst resulting fromthe basic nature of the reactant and product molecules.
Keywords: Sulphated V2O5/SnO2 catalysts, acidity, vapour phase Beckmann rearrangement
