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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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cris.virtual.department Universiti Malaysia Perlis
cris.virtualsource.department 23a69086-aaba-4b0f-97cd-ffdd65e35300
dc.contributor.author Naimah Ibrahim
dc.contributor.author Danai Poulidi
dc.contributor.author Ian S. Metcalfe
dc.date.accessioned 2024-12-31T15:55:57Z
dc.date.available 2024-12-31T15:55:57Z
dc.date.issued 2013-04-23
dc.description.abstract 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.
dc.identifier.doi 10.1016/j.jcat.2013.03.015
dc.identifier.uri https://hdl.handle.net/20.500.14170/11211
dc.language.iso en
dc.relation.ispartof Journal of Catalysis
dc.relation.issn 0021-9517
dc.subject EPOC
dc.subject Surface impurities
dc.subject Sodium promotion
dc.subject Platinum
dc.subject Ethylene oxidation
dc.title The role of sodium surface species on electrochemical promotion of catalysis in a Pt/YSZ system: The case of ethylene oxidation
dc.type journal-article
dspace.entity.type Publication
oaire.citation.endPage 109
oaire.citation.startPage 100
oaire.citation.volume 303
oairecerif.author.affiliation Universiti Malaysia Perlis
oairecerif.author.affiliation Newcastle University
oairecerif.author.affiliation Newcastle University
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