The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation
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2013
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my.unimap-274392013-08-13T09:20:50Z The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation Naimah, Ibrahim Poulidi, Danai Metcalfe, Ian S. EPOC Ethylene oxidation Platinum Sodium promotion Surface impurities Link to publisher's homepage at http://www.elsevier.com/ The role of sodium addition as foreign (impurity) species on the electrochemical promotion of ethylene oxidation in a Pt/YSZ system was investigated. It was found that the presence of sodium surface species on the catalyst surface can significantly affect its catalytic and electrocatalytic properties, but there is no clear evidence at this stage that such species are necessary for the observation of EPOC. Under negative polarisation, low coverage sodium was found to have a pronounced effect on the electrochemical promotion of ethylene oxidation as an electronic promoter. The reaction changed behaviour from electrophilic at low sodium coverage (0.11%) and low to intermediate oxygen partial pressure (pO2 ≤ 3.0 kPa) to electrophobic at high sodium coverage (65%) and under high oxygen partial pressures (pO2 = 8.0 kPa). In between the two sets of conditions, the reaction showed volcano-type behaviour depending on the coverage of sodium and gas-phase oxygen partial pressure. 2013-08-13T09:20:50Z 2013-08-13T09:20:50Z 2013-07 Article Journal of Catalysis, vol. 303, 2013, pages 100-109 0021-9517 http://www.sciencedirect.com/science/article/pii/S0021951713001000 http://hdl.handle.net/123456789/27439 en Elsevier Inc. |
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Universiti Malaysia Perlis |
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English |
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EPOC Ethylene oxidation Platinum Sodium promotion Surface impurities |
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EPOC Ethylene oxidation Platinum Sodium promotion Surface impurities Naimah, Ibrahim Poulidi, Danai Metcalfe, Ian S. The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| description |
Link to publisher's homepage at http://www.elsevier.com/ |
| format |
Article |
| author |
Naimah, Ibrahim Poulidi, Danai Metcalfe, Ian S. |
| author_facet |
Naimah, Ibrahim Poulidi, Danai Metcalfe, Ian S. |
| author_sort |
Naimah, Ibrahim |
| title |
The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| title_short |
The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| title_full |
The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| title_fullStr |
The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| title_full_unstemmed |
The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation |
| title_sort |
role of sodium surface species on electrochemical promotion of catalysis in a pt/ysz system: the case of ethylene oxidation |
| publisher |
Elsevier Inc. |
| publishDate |
2013 |
| url |
http://dspace.unimap.edu.my/xmlui/handle/123456789/27439 |
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1643795263659180032 |