The kinetics of oxidative coupling of methane (OCM) reactions over Mn/Na2WO4/SiO2 catalyst has been studied in an isothermal fixed bed micro-reactor. The experiments were carried out at 1048-1123 K. inlet methane to oxygen molar ratios of 2-6, gas hourly space velocity (GHSV) of 4000-8000 h(-1) and inert (N-2) mole fraction (20-60 mol%) and atmospheric pressure. A detailed micro-kinetic model was proposed. The model contains 39 elementary steps describing the gas phase reactions and 11 surface catalytic reactions. The proposed model can predict the conversion of methane and selectivity of ethane, ethylene, carbon monoxide and carbon dioxide with an average deviation of 11.1%, 11.5%, 13.6%, 10.1% and 12.3% respectively. In addition, the effects of some operating parameters on the performance of OCM reaction over Mn/Na2WO4/SiO2 catalyst were investigated by developed micro-kinetic model. (C) 2013 Elsevier B.V. All rights reserved.