Methane conversion to higher hydrocarbons via electric discharge plasmas over zeolite catalysts

摘要

Plasma reactors have bene found to be an effective technique for the activation of methane,the ajor ocmponent of naturla gas,at low temperatures.The electric distcharges porduce energetic electrons that excite and decompose the feed gas molecules.therefore,reactions are accomplished with relatively low power requriemetns.the catalyst,NaY zeolite,enhances the production of electrons and the formation of methane radicals.Methane and hydrogen with oxygen as an additive and helium as a diluent are used as the feed mixture.Acctylene is the majro product with hydrogen as a by-product.The conversion and selectiveikty are affected by th residence time,gas temperature,oxygen partial pressure,and by the addition of othe radditives and ddiluents.The best plasma catalytic activity is acheived when streamer discharges are present,which occur at low gas temperatures.THe highest methane conversion (63.5