Solid electrolyte cyclic voltammetry for in situ investigation of catalyst surfaces

The technique of cyclic linear potential sweep chronoamperometry, more commonly termed cyclic voltammetry, has been applied for the first time, in conjunction with on-line mass spectrometry, IR spectroscopy, and gas chromatography, to investigate the chemisorptive and catalytic properties of porous...

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Bibliographic Details
Published in:Journal of catalysis 1991-05, Vol.129 (1), p.67-87
Main Authors: Vayenas, C.G., Ioannides, A., Bebelis, S.
Format: Article
Language:English
Subjects:
02 PETROLEUM
020400 - Petroleum- Processing
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
Adsorption
ALKENES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHEMISORPTION
Chemistry
CHROMATOGRAPHY
ELECTROCHEMICAL CELLS
Electrochemistry
ELECTRODES
ELECTROLYTES
ELEMENTS
ETHYLENE
Exact sciences and technology
GAS CHROMATOGRAPHY
General and physical chemistry
HYDROCARBONS
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
MASS SPECTROSCOPY
METALS
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN
PERFORMANCE TESTING
PLATINUM
PLATINUM METALS
POROSITY
SEPARATION PROCESSES
SOLID ELECTROLYTES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
Study of interfaces
SURFACE PROPERTIES
TESTING
TRANSITION ELEMENTS
VOLTAMETRY
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Summary:The technique of cyclic linear potential sweep chronoamperometry, more commonly termed cyclic voltammetry, has been applied for the first time, in conjunction with on-line mass spectrometry, IR spectroscopy, and gas chromatography, to investigate the chemisorptive and catalytic properties of porous metal catalyst films also functioning as electrodes in solid electrolyte cells. The cases of O 2 adsorption and C 2H 4 oxidation on Pt were examined. It was found that solid electrolyte cyclic voltammetry (SECV), which causes a cyclic variation in catalyst work function, provides useful in situ information about the coverage of adsorbed species and also about the occurence of non-Faradaic electrochemical modification of catalytic activity (NEMCA effect) on the catalyst surface. The technique also permits estimation of the “length” of the catalyst-solid electrolyte-gas three-phase boundaries.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(91)90010-2