In situ controlled promotion of catalyst surfaces via NEMCA: The effect of Na on the Pt-catalyzed CO oxidation
Journal Article
·
· Journal of Catalysis; (United States)
- Univ. of Patras (Greece)
- Univ. of Cambridge (United Kingdom)
It was found that the catalytic activity of Pt for CO oxidation can be markedly and reversibly affected by depositing polycrystalline Pt films on [beta][double prime]-Al[sub 2]O[sub 3], a Na[sup +] conductor, and applying external potentials to supply or remove Na to or from the Pt catalyst surface. The change in the rate of CO oxidation is typically 10[sup 3]-10[sup 5] times larger than the rate of supply or removal of Na. The use of the [beta][double prime]-Al[sub 2]O[sub 3] solid electrolyte supports permits precise in situ control of the Na coverage on the Pt surface. Sodium coverages of 0.02 cause up to 600% steady-state increase in the rate of CO oxidation under CO-rich conditions. The promoting effect is due to enhanced oxygen chemisorption on the Pt surface. Higher (>0.06) Na coverages poison the rate severely and reversibly due to the formation of a CO-Na-Pt surface complex. Rate oscillations can be reversibly induced or stopped and their frequency can be controlled by controlling the catalyst potential V[sub WR] and average work function e[Phi]. 46 refs., 12 figs., 1 tab.
- OSTI ID:
- 6816401
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 146:1; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Journal Article
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Fri Feb 28 23:00:00 EST 1997
· Journal of Catalysis
·
OSTI ID:478761
In situ controlled promotion of Pt for CO oxidation via NEMCA using CaF{sub 2} as the solid electrolyte
Journal Article
·
Thu Sep 01 00:00:00 EDT 1994
· Journal of Catalysis
·
OSTI ID:110993
Non-faradaic electrochemical modification of catalytic activity: 4. The use of. Beta. double prime -Al sub 2 O sub 3 as the solid electrolyte
Journal Article
·
Sun Mar 31 23:00:00 EST 1991
· Journal of Catalysis; (USA)
·
OSTI ID:5629110
Related Subjects
01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
FUNCTIONS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POTENTIALS
SODIUM
TRANSITION ELEMENTS
WORK FUNCTIONS
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALKALI METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
FUNCTIONS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POTENTIALS
SODIUM
TRANSITION ELEMENTS
WORK FUNCTIONS