Research on the Electrochemical Oxidation of Hexane and Its Isomers
Semiannual interim rept. no. 7, 16 Nov 1968-15 May 1969
TYCO LABS INC WALTHAM MA
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The oxidation of CH4 on Pt electrodes in 80 H3PO4 at 130 deg C has been studied. Emphasis has been put on the development of non-noble metal catalysts. To prevent corrosion the approach has been to stabilize these catalysts by adsorption. Studies were made of the adsorption of Cu from solutions containing Cu. Cu adsorption on Pt is controlled by the rate of diffusion of Cu to the Pt electrode. Comparisons of the charge to oxidize the Cu layer, Q, with its coverage, allow evaluation of the number of electrons released per site when the layer is oxidized. CH4 adsorbs on Pt in the presence of Cu. In general, the charge to oxidize a combined Cu CH4 layer is greater than that to oxidize either of the two separately produced layers, but far less than the sum of the charges to oxidize these two individual layers. The adsorption of Ni from solutions containing Ni has been studied with smooth and platinized Pt electrodes. It has been observed that the minor impurity carried with Ni kinetically inhibits CH4 adsorption. Studies were made of the effect of Ni on the oxidation kinetics of CH4 and on the oxidation kinetics of O-type CH4. Small concentrations of Ni in solution caused profound changes in the shape of the O-type stripping curve. Ni in solution catalyzes the over-all CH4 to CO2 process. The extent of this catalysis varies with potential.
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