Abstract
The electrocatalytic nonoxidative dimerization of methane to C 2 hydrocarbons (ethane and ethylene) was studied at 700–750°C and atmospheric total pressure. The reaction was studied in the electrochemical cells: Ag|SCY|Ag and Ag|YSZ|Ag where SCY is proton-conducting ytterbium-doped strontia-ceria and YSZ is oxygen-ion conducting yttria-stabilized zirconia. Under open circuit, a steady rate state of methane consumption r 0 was observed. Upon imposing a current or constant voltage through either electrolyte cell, the rate increased to a new steady state value r. The maximum ratio r/ r 0 was 8 for I=50 mA and V= 2.80 V at 750°C for the single-chamber SCY cell. Upon interruption of the current, the rate returned to r 0. The single-chamber cell can possibly replace a conventional catalyst support.
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