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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Cobalt Species Active for Nitrous Oxide (N2O) Decomposition within a Temperature Range of 300–600°C

Naseer A. Khan A B , Eric M. Kennedy A , Bogdan Z. Dlugogorski C , Adesoji A. Adesina D and Michael Stockenhuber A E
+ Author Affiliations
- Author Affiliations

A Priority Research Centre for Energy (PRCfE), The University of Newcastle, Callaghan, NSW 2308, Australia.

B Department of Chemical Engineering, University of Engineering and Technology (UET) Peshawar, Khyber Pakhtunkhwa (KPK), Pakistan.

C School of Engineering and IT, Murdoch University, Perth, WA 6150, Australia.

D ATODATECH LLC, Brentwood, CA 94513, USA.

E Corresponding author. Email: michael.stockenhuber@newcastle.edu.au

Australian Journal of Chemistry 70(10) 1138-1145 https://doi.org/10.1071/CH17172
Submitted: 26 March 2017  Accepted: 11 June 2017   Published: 24 August 2017

Abstract

This article presents a novel study of the role of the catalyst support towards the formation of active cobalt sites for N2O conversion reactions within a temperature range of 300–600°C. These reactions were examined in a fixed bed tubular reactor. ZSM-5 (Si/ Al = 15), TS-1, and amorphous silicates were used as catalyst supports for cobalt loadings. All catalysts were prepared by following standard methods and recipes. In general, cobalt loading on supports was varied between 0.78 and 5.40 wt.-% (as determined from inductively coupled plasma (ICP) analysis). ICP, temperature programmed desorption, X-ray diffraction, and N2 adsorption/desorption isotherms were used for the characterization of prepared catalysts. Cobalt on ZSM-5 support generates weak and strong acid sites. Furthermore, for the Co-ZSM-5 catalyst, prepared by a wet deposition method, the N2O decomposition reaction is first order with an activation energy of ~132 kJ mol−1. Co2+ and Co3+ are the suggested active species for the N2O conversions in the studied range of temperatures.


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