Bioethanol conversion has been studied on zeolite catalysts ZSM-5 type, simple and modified by impregnation with hydrogenating function metals. The study carried on in micropilot laboratory installation in catalyst fixed bed. Operation conditions were: temperature range 350-450C, pressure range 1-50 bar, hourly space velocities range for ethanol 0.5-2 h -1. The reaction carried on in nitrogen inert atmosphere and in the presence of hydrogen. Reaction products were collected as gaseous fraction and analyzed by gas-chromatography to establish the composition as C1-C4 fraction, alkanes and alkenes. It was emphasized the influence of operating parameters catalysts type on C1-C4 compounds distribution in gaseous products.