Accession Number:

AD0783346

Title:

Origin of Activation Effects of Acetonitrile and Mercury in Electrocatalytic Oxidation of Formic Acid,

Descriptive Note:

Corporate Author:

OTTAWA UNIV (ONTARIO) DEPT OF CHEMISTRY

Report Date:

1972-12-11

Pagination or Media Count:

13.0

Abstract:

In the presence of catalyst poisons such as acetonitrile or mercury, it is shown that the currents for formic acid oxidation, measured in the potential range 0.4 to 0.8V EH at Pt can be substantially increased. The effect is shown to originate from blocking of the surface at less positive potentials mainly in the H adsorptiondesorption region where an inhibitor for the main formic acid oxidation reaction is normally formed in the absence of additive. Under the latter conditions, steady-state oxidation currents are normally small and decrease with time due to build-up of an inhibiting species from the HCOOH or intermediates involved in its oxidation. The competitive effects of Hg and CH3CN are different insofar as a given extent of surface blocking causes different effects on the formic acid oxidation current. Comparative experiments on the effect of CH3CN on methanol oxidation are described. Modified author abstract

Subject Categories:

  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE