Coupling and reforming of methane with carbon dioxide were studied at room
temperature and 773 K in a pulsed plasma. Methane and carbon dioxide could
be converted mainly to ethylene, carbon monoxide, and hydrogen at room temp
erature. At 773 K, the main product was ethane at a low pulse frequency and
ethylene at a high pulse frequency. The energy efficiency can be significa
ntly improved by using a high pulse frequency and high temperature.