Gas hydrate from CO₂/H₂ gas mixtures was formed in a semi-batch stirred vessel at constant pressure and temperature of 280.1K. This mixture is of interest to CO₂ separation and recovery from fuel gas. During hydrate formation the gas uptake was determined and composition change in the gas phase were obtained by gas chromatography. When CO₂/H₂ hydrate formation, the impact of tetrahydrofuran (THF) was observed. The addition of THF not only reduced significantly the operating pressure but also helped to form hydrates easier(shorter induction time). The present study illustrates the concept and provides basic for the separation/recovery of CO₂ (precombustion capture) from a fuel gas(CO₂/H₂) mixture.