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 · Mon Apr 01 04:00:00 EST 1991 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90300-S· OSTI ID:5629110

Vayenas, C G; Despotopoulou, M ^[1]

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1. Univ. of Patras (Greece)

It was found that the catalytic activity of polycrystalline Pt films deposited on {beta}-Al{sub 2}O{sub 3}, a Na{sup +} - conducting solid electrolyte, can be altered dramatically and reversibly by polarizing the catalyst-solid electrolyte interface. The observed decrease in the rate of ethylene oxidation on Pt is typically 10{sup 3} {minus} 5 {times} 10{sup 4} times larger than the rate of supply Na{sup +} to the catalyst-electrolyte interface. A Na coverage of 0.015 suffices to cause a 70% decrease in catalytic rate which varies exponentially with catalyst work function. The latter was measured both potentiometrically and by means of a Kelvin probe. The behavior is qualitatively similar to that observed when using O{sup 2{minus}} - conducting solid electrolytes and shows that the newly found effect of non-faradaic electrochemical modification of catalytic activity (NEMCA) is not restricted to any particular metal or solid electrolyte. This supports the proposed explanation of the effect which is based on the change in catalyst work function and concomitant change in chemisorptive bond strengths as a result of ion spillover upon polarization of the catalyst-solid electrolyte interface.

• OSTI ID: 5629110
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 128:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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02 PETROLEUM
020400* -- Petroleum-- Processing
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CATALYST SUPPORTS
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CATALYTIC EFFECTS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
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