Search:
Computing and Library Services - delivering an inspiring information environment

Tungstated Zirconia Catalysts for Liquid-Phase Beckmann Rearrangement of Cyclohexanone Oxime: Structure-Activity Relationship

Shiju, N.R., AnilKumar, M., Hoelderich, W.F. and Brown, D.R. (2009) Tungstated Zirconia Catalysts for Liquid-Phase Beckmann Rearrangement of Cyclohexanone Oxime: Structure-Activity Relationship. The Journal of Physical Chemistry C, 113 (18). pp. 7735-7742. ISSN 19327447

Metadata only available from this repository.

Abstract

The performance of tungstated zirconia catalysts with different tungsten loadings and calcination temperatures for liquid-phase Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam was studied and the relation of their activity with the structure of tungsten species on zirconia surface was investigated. Cyclohexanone was the major product when zirconia was used as the catalyst while ε-caprolactam was formed in major amounts with tungstated zirconia. The relative amounts of these products depended on the W surface density, and the maximum selectivity to ε-caprolactam was observed at tungsten loadings near that required for the formation of a monolayer. UV−visible absorption edge energies suggested that the surface contains polytungstate species at these loadings. These polytungstate domains create Brønsted acid centers on the surface, as suggested by acidity measurements using NH3 adsorption microcalorimetry and FTIR of adsorbed pyridine, thereby making the tungstated zirconia catalysts active for the formation of ε-caprolactam.

Item Type: Article
Subjects: Q Science > QD Chemistry
Schools: School of Applied Sciences
School of Applied Sciences > Materials and Catalysis Research Centre
Related URLs:
Depositing User: Graham Stone
Date Deposited: 11 Jun 2009 13:01
Last Modified: 28 Jul 2010 04:48
URI: http://eprints.hud.ac.uk/id/eprint/4684

Item control for Repository Staff only:

View Item

University of Huddersfield, Queensgate, Huddersfield, HD1 3DH Copyright and Disclaimer All rights reserved ©