Non-faradaic electrochemical modification of catalytic activity. 2. The case of methanol dehydrogenation and decomposition on Ag

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90307-2· OSTI ID:7271266

Neophytides, S; Vayenas, C G ^[1]

---

1. Univ. of Patras (Greece)

It was found that the catalytic activity and selectivity of polycrystalline Ag for the dehydrogenation and decomposition of CH{sub 3}OH can be markedly affected by electrochemically pumping oxygen anions from the catalyst surface via stabilized zirconia solid electrolyte cells. The steady-state increases in catalytic rates are typically a factor of 20 higher than the rate of O{sup 2{minus}} transfer from the catalyst surface. Oxygen anion pumping causes up to sixfold increases in the rates of production of H{sub 2}CO, CO, and CH{sub 4} and induces significant changes in product selectivity. Over a wide range of conditions the rates of the catalytic reactions increase exponentially with catalyst-solid electrolyte interface overpotential {eta}, which is proportional to the induced change in catalyst work function. The phenomena are reversible and show that catalyst work function and catalytic activity and selectivity can be varied deliberately by adjusting the catalyst potential. The observed non-Faradaic rate enhancement for this catalytic system can be interpreted by taking into account the decrease in catalyst work function with decreasing catalyst potential and the consequent changes in the strength of chemisorptive bonds.

• OSTI ID: 7271266
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 118:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
ALCOHOLS
ALDEHYDES
ALKANES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL REACTIONS
CHEMISORPTION
DECOMPOSITION
DEHYDROGENATION
DEPOSITION
ELECTROCHEMICAL COATING
ELECTROLYTES
ELEMENTS
FORMALDEHYDE
HYDROCARBONS
HYDROXY COMPOUNDS
METALS
METHANE
METHANOL
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SILVER
SOLID ELECTROLYTES
SORPTION
SURFACE COATING
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES