title: Structure and speciation of chromium ions in chromium doped Fe2O3 catalysts.
abstract: In this paper, we report a detailed characterisation of chromium doped iron oxide catalysts using a range of techniques to establish the nature of chromium species in the near surface and bulk of iron oxide, high-temperature shift (HTS) catalysts. In particular we have employed X-ray absorption spectroscopy Cr K-edge near edge and extended fine structure data for comparison with chemical and X-ray photoelectron spectroscopy. There was excellent agreement between the techniques in terms of identification and quantification of Cr(6+) and Cr(3+) species as a function of calcination temperatures between 100 and 500 °C.
authors.affiliation: University College London, Department of Chemistry, 20 Gordon Street, London, WC1H 0AJ, UK.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Martis
authors.forename: Richard
authors.initials: R
authors.lastname: Oldman
authors.forename: Ross
authors.initials: R
authors.lastname: Anderson
authors.forename: Martin
authors.initials: M
authors.lastname: Fowles
authors.forename: Tim
authors.initials: T
authors.lastname: Hyde
authors.forename: Richard
authors.initials: R
authors.lastname: Smith
authors.forename: Sergey
authors.initials: S
authors.lastname: Nikitenko
authors.forename: Wim
authors.initials: W
authors.lastname: Bras
authors.forename: Gopinathan
authors.initials: G
authors.lastname: Sankar