XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition.

Kirste, K. G., Laassiri, S., Hu, Z., Stoian, D., Torrente-Murciano, L., Hargreaves, J. S.J. and Mathisen, K. (2020) XAS investigation of silica aerogel supported cobalt rhenium catalysts for ammonia decomposition. Physical Chemistry Chemical Physics, 22(34), pp. 18932-18949. (doi: 10.1039/d0cp00558d) (PMID:32567607)

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Abstract

The implementation of ammonia as a hydrogen vector relies on the development of active catalysts to release hydrogen on-demand at low temperatures. As an alternative to ruthenium-based catalysts, herein we report the high activity of silica aerogel supported cobalt rhenium catalysts. XANES/EXAFS studies undertaken at reaction conditions in the presence of the ammonia feed reveal that the cobalt and rhenium components of the catalyst which had been pre-reduced are initially re-oxidised prior to their subsequent reduction to metallic and bimetallic species before catalytic activity is observed. A synergistic effect is apparent in which this re-reduction step occurs at considerably lower temperatures than for the corresponding monometallic counterpart materials. The rate of hydrogen production via ammonia decomposition was determined to be 0.007 molH2 gcat−1 h−1 at 450 °C. The current study indicates that reduced Co species are crucial for the development of catalytic activity.

Item Type:Articles
Additional Information:LTM acknowledges financial support from the EPSRC through EP/L020423/2 and EP/N013778/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Laassiri, Dr Said and Hargreaves, Professor Justin
Authors: Kirste, K. G., Laassiri, S., Hu, Z., Stoian, D., Torrente-Murciano, L., Hargreaves, J. S.J., and Mathisen, K.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Physical Chemistry Chemical Physics
Publisher:Royal Society of Chemistry
ISSN:1463-9076
ISSN (Online):1463-9084
Published Online:12 June 2020
Copyright Holders:Copyright © the Owner Societies 2020
First Published:First published in Physical Chemistry Chemical Physics 22(34): 18932-18949
Publisher Policy:Reproduced under a Creative Commons license

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