Showing papers by "Vladimir Galvita published in 1997"

Electrocatalytic conversion of methane to syngas over Ni electrode in a solid oxide electrolyte cell

Abstract: Electrocatalytic conversion of metane in a cell with a solid oxygen conducting electrolyte: CH 4 , Ni|0.9ZrO 2 + 0.1Y 2 O 3 |Pt + PrO 2 , air was studied at the temperature range 750°C–850°C. The Ni electrode was found to be an active electrode-catalyst for partial oxidation of CH 4 to syngas with the concentration ratio [H 2 ] : [CO]≈2 . The CH 4 conversion and CO selectivity attained 85%–95% and 90%–95%, respectively, at 800°C–850°C. Under these conditions the Ni electrode-catalyst was stable to coking and had a negative value of electrode potential with respect to an air counter electrode. The direct partial oxidation mechanism was shown to be the most probable for the electrocatalytic conversion of CH 4 to syngas.

Non-Faradaic catalysis : the case of CO oxidation over Ag-Pd alloy electrode in a solid oxide electrolyte cell

Abstract: Studies of carbon monoxide oxidation on an Ag-25 at% Pd alloy electrode in a cell with a solid oxygen-conducting electrolyte - CO+O2, Ag-Pd | 0.9 ZrO2+0.1Y2O3 | Pt+PrO2-x, air - were carried out. XRD, SEM and XPS techniques were used for characterisation of the Ag-Pd alloy electrode. The non-Faradaic effect of electrochemical oxygen pumping on the rate of carbon monoxide oxidation was demonstrated. The induced change in the reaction rate at cathodic polarization of the Ag-Pd alloy electrode was an order of magnitude higher than the rate of oxygen pumping from the reaction zone through the electrolyte. The observed phenomenon was qualitatively explained on the base of a chain reaction mechanism involving electrochemically generated oxygen species.