The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation
The effect of carbon monoxide (CO) co-adsorption on the dissociation of water on the Ni(111) surface has been studied using density functional theory. The structures of the adsorbed water molecule and of the transition state are changed by the presence of the CO molecule. The water O–H bond that is...
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doaj-565ea18df1744e50af40a89a742fd7492020-11-24T21:05:41ZengMDPI AGInternational Journal of Molecular Sciences1422-00672013-11-011412233012331410.3390/ijms141223301ijms141223301The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water DissociationAbas Mohsenzadeh0Anders Borjesson1Jeng-Han Wang2Tobias Richards3Kim Bolton4School of Engineering, University of Borås, Borås SE 501-90, SwedenSchool of Engineering, University of Borås, Borås SE 501-90, SwedenDepartment of Chemistry, National Taiwan University, No. 88, Sec. 4, Ting-Chow Rd, Taipei 11677, TaiwanSchool of Engineering, University of Borås, Borås SE 501-90, SwedenSchool of Engineering, University of Borås, Borås SE 501-90, SwedenThe effect of carbon monoxide (CO) co-adsorption on the dissociation of water on the Ni(111) surface has been studied using density functional theory. The structures of the adsorbed water molecule and of the transition state are changed by the presence of the CO molecule. The water O–H bond that is closest to the CO is lengthened compared to the structure in the absence of the CO, and the breaking O–H bond in the transition state structure has a larger imaginary frequency in the presence of CO. In addition, the distances between the Ni surface and H2O reactant and OH and H products decrease in the presence of the CO. The changes in structures and vibrational frequencies lead to a reaction energy that is 0.17 eV less exothermic in the presence of the CO, and an activation barrier that is 0.12 eV larger in the presence of the CO. At 463 K the water dissociation rate constant is an order of magnitude smaller in the presence of the CO. This reveals that far fewer water molecules will dissociate in the presence of CO under reaction conditions that are typical for the water-gas-shift reaction.http://www.mdpi.com/1422-0067/14/12/23301water adsorptionwater dissociationnickelwater gas shift reactionCOH2ODFT |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Abas Mohsenzadeh Anders Borjesson Jeng-Han Wang Tobias Richards Kim Bolton |
spellingShingle |
Abas Mohsenzadeh Anders Borjesson Jeng-Han Wang Tobias Richards Kim Bolton The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation International Journal of Molecular Sciences water adsorption water dissociation nickel water gas shift reaction CO H2O DFT |
author_facet |
Abas Mohsenzadeh Anders Borjesson Jeng-Han Wang Tobias Richards Kim Bolton |
author_sort |
Abas Mohsenzadeh |
title |
The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation |
title_short |
The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation |
title_full |
The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation |
title_fullStr |
The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation |
title_full_unstemmed |
The Effect of Carbon Monoxide Co-Adsorption on Ni-Catalysed Water Dissociation |
title_sort |
effect of carbon monoxide co-adsorption on ni-catalysed water dissociation |
publisher |
MDPI AG |
series |
International Journal of Molecular Sciences |
issn |
1422-0067 |
publishDate |
2013-11-01 |
description |
The effect of carbon monoxide (CO) co-adsorption on the dissociation of water on the Ni(111) surface has been studied using density functional theory. The structures of the adsorbed water molecule and of the transition state are changed by the presence of the CO molecule. The water O–H bond that is closest to the CO is lengthened compared to the structure in the absence of the CO, and the breaking O–H bond in the transition state structure has a larger imaginary frequency in the presence of CO. In addition, the distances between the Ni surface and H2O reactant and OH and H products decrease in the presence of the CO. The changes in structures and vibrational frequencies lead to a reaction energy that is 0.17 eV less exothermic in the presence of the CO, and an activation barrier that is 0.12 eV larger in the presence of the CO. At 463 K the water dissociation rate constant is an order of magnitude smaller in the presence of the CO. This reveals that far fewer water molecules will dissociate in the presence of CO under reaction conditions that are typical for the water-gas-shift reaction. |
topic |
water adsorption water dissociation nickel water gas shift reaction CO H2O DFT |
url |
http://www.mdpi.com/1422-0067/14/12/23301 |
work_keys_str_mv |
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1716767879622295552 |