A nozzle, fabricated from nickel, molybdenum, iron, palladium, and quartz was utilized to produce longer chain hydrocarbons, CmHn (m greater than or equal to 3, n less than or equal to m) from C-2 (ethane, acetylene) and C-1 (methane) reactants at nozzle temperature range 1000-1150(degrees)C. The conversion of ethane was close to 100% at T-noz=1000(degrees)C, while that of methane reached 20% at T-noz=1150(degrees)C. The contact time in the nozzle is in the 10(-3)-10(-2) s range. The reactions are first and higher order in reactant pressure. The reaction mechanism involves the formation of free radicals at the nozzle surface followed by gas-phase reactions.