a heated reaction gas comprising methane is contacted with first and second catalysts to catalyze production of an aromatic hydrocarbon . the first catalyst is more active than the second catalyst for catalyzing aromatization of methane , and the second catalyst is more active than the first catalyst for catalyzing aromatization of ethane . a reactor for producing aromatic hydrocarbons from the reaction gas may have a conduit defining a reaction zone for the reaction gas to react therein , and the first and second catalysts may be disposed in the reaction zone .