Yang Lim, J., McGregor, J. orcid.org/0000-0001-6813-306X, Sederman, A.J. et al. (1 more author) (2016) The role of the Boudouard and water-gas shift reactions in the methanation of CO or CO2 over Ni/γ-Al2O3 catalyst. Chemical Engineering Science, 152. pp. 754-766. ISSN 1873-4405
Abstract
The Boudouard and the water-gas shift reactions were studied at different temperatures between 453 and 490 K over a Ni/γ-Al2O3 catalyst in a Carberry batch reactor using various mixtures of CO, H2 and CO2. The activity of the Boudouard reaction was found to be low, compared to the water-gas shift reaction, and diminished over time, suggesting that the temperature was too low for significant activity after an initiation period of CO adsorption. Furthermore, the rate of the Boudouard reaction has been reported to decrease in the presence of H2O and H2. The water-gas shift reaction was found to be the main reaction responsible for the production of CO2 in a mixture of CO, H2 and H2O in the batch reactor. The ratio of the total amount of CO consumed to the total amount of CO2 produced showed that the catalyst was also active towards hydrogenation, where the rate of the hydrogenation reaction was very much faster than the water-gas shift reaction. The resulting ratio of pH2 to pCO was found to be extremely low, probably leading to the production of long-chain hydrocarbons. The stoichiometry of the overall reaction was such that for every mole of mole of CO2 produced, 1.5 mol of CO was consumed in the batch reactor. Kinetic studies were performed in the batch reactor. An Eley-Rideal mechanism was found to provide a good agreement with the experimental results over a wide range of partial pressures of steam and CO.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016 Elsevier. This is an author produced version of a paper subsequently published in Chemical Engineering Science. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | CO and CO2 methanation; nickel-alumina catalyst; Carberry batch reactor; reaction mechansim; water-gas shift |
Dates: |
|
Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Chemical and Biological Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 Jul 2016 13:44 |
Last Modified: | 01 Jul 2017 18:32 |
Published Version: | http://dx.doi.org/10.1016/j.ces.2016.06.042 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.ces.2016.06.042 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:102451 |