Non-Faradaic electrochemical modification of catalytic activity. VII. The case of methane oxidation on platinum

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1068· OSTI ID:6130589

Tsiakaras, P; Vayenas, C G ^[1]

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1. Univ. of Patras (Greece)

It was found that the catalytic activity of Pt for the oxidation of CH[sub 4] can be increased reversibly by up to 7,000% by depositing polycrystalline Pt films on Y[sub 2]O[sub 3]-doped ZrO[sub 2], an O[sup 2[minus]] conductor, and by polarizing the Pt-solid electrolyte interface. The catalytic rate is enhanced, to a different extent, both by supplying and by removing O[sup 2[minus]] to or from the Pt catalyst through the gas-impervious solid electrolyte. The rate of CH[sub 4] oxidation was found to depend exponentially on catalyst potential and work function e[Phi] over wide (up to 0.8 eV) e[Phi] ranges. Within the same e[Phi] ranges the catalytic activation energy E varies linearly with e[Phi] and can be lowered from 40 kcal/mol to 11 kcal/mol. The observed behavior can be accounted for within the framework of previous NEMCA studies, although in the present case, due to high operating temperatures, the role of direct electrocatalytic reactions is more pronounced. 45 refs., 12 figs., 1 tab.

• OSTI ID: 6130589
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 140:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
033000 -- Natural Gas-- Properties & Composition
10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKANES
ANIONS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLYTES
ENERGY
FILMS
FUNCTIONS
HYDROCARBONS
IONIC CONDUCTIVITY
IONS
KINETICS
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM COMPOUNDS
POLARIZATION
REACTION KINETICS
SOLID ELECTROLYTES
TRANSITION ELEMENT COMPOUNDS
WORK FUNCTIONS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES