The catalytic conversion of a methane and ethylene mixture to gasoline range hydrocarbons has been studied over W/HZSM-5 catalyst. The effect of process variables, such as temperature, percentage of volume If ethylene in the methane stream and catalyst loading on the distribution of hydrocarbons was studied. The reaction was conducted in a fixed-bed quartz-micro reactor in the temperature range of 300500 degrees C using percentage of volume of ethylene in methane stream between 25 and 75% and catalyst loading of 0.2-0.4 g. The catalyst showed good catalytic performance yielding hydrocarbons consisting of gaseous products along with gasoline range liquid products. The mixed feed stream can be converted to higher hydrocarbons containing a high-liquid gasoline product selectivity (> 42%). Non-aromatics C-5-C-10 hydrocarbons selectivity in the range of 12-53% was observed at the operating conditions studied. Design of experiment was employed to determine the optimum conditions for maximum liquid hydrocarbon products. The distribution of the gasoline range hydrocarbons (C-5-C-10 non-aromatics and aromatics hydrocarbons) was also determined for the optimum conditions. (c) 2005 Elsevier B.V. All rights reserved.