The present paper reports on the results of a systematic investigation of the conversion, at temperature around 500 C and atmospheric pressure, of propane and n.butane on a ZSM-5 catalyst loaded with Pt or Pt and Re, presulfided or not by hydrogen sulfide. When presulfided the bimetallic catalyst leads to a high BTX selectivity, low ethane and methane selectivities and low coke formation. These are attractive features for a commercial process.