Hydrogen for fuel cell applications has been generated by catalytic steam reforming of ethanol in microstructures. The influence of reaction temperature, contact time and molar ratio steam to carbon (S/C) on the reaction has been investigated. The Co/ZnO catalyst coated on the microstructure showed high activity and selectivity. The hydrogen yield obtained was up to 5.2 mol mol(-1) ethanol. Ethanol has been completely converted at short contact time (W/F 25 g min mol(-1)) and 600 degrees C at S/C ratio between 4.9 and 6.5.