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Nitrogen transfer properties in tantalum nitride based materials

Laassiri, S; Zeinalipour-Yazdi, CD; Catlow, CRA; Hargreaves, JSJ; (2016) Nitrogen transfer properties in tantalum nitride based materials. Catalysis Today , 286 pp. 147-154. 10.1016/j.cattod.2016.06.035. Green open access

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Abstract

Ta3-xMxNy (M=Re, Fe, Co; x=0, 0.25, 0.5, 1) materials with different microstructural features (e.g. surface area) were successfully prepared using different synthesis techniques. The dependence of nitrogen transfer properties upon tantalum nitride microstructure and its chemical composition was evaluated using the ammonia synthesis with a H2/Ar feedstream (a reaction involving lattice nitrogen transfer). It was shown that nitrogen reactivity for tantalum nitride is more dominated by lattice nitrogen stability rather than microstructural properties. In the case of non-doped tantalum nitride, only a limited improvement of reactivity with enhanced surface area was observed which demonstrates the limited impact of microstructure upon reactivity. However, the nature of the transition metal dopant as well as its content was observed to play a key role in the nitrogen transfer properties of tantalum nitride and to impact strongly upon its reactivity. In fact, doping tantalum nitride with low levels of Co resulted in enhanced reactivity at lower temperature.

Type: Article
Title: Nitrogen transfer properties in tantalum nitride based materials
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cattod.2016.06.035
Publisher version: http://doi.org/10.1016/j.cattod.2016.06.035
Language: English
Additional information: © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Lattice nitrogen; Tantalum nitride; Nitrogen transfer reaction
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1503786
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