Thermodynamic measurements were performed to show the possibility of recovering CO2 from fuel gas (the mixture of CO2 and H2) by forming gas hydrates with water where water was dispersed in the pores of silica gel particles having nominal 100 nm of pore diameter. The hydrate-phase equilibria for the ternary CO2+H2+water in pores were measured and CO2 concentrations in vapor and hydrate phase were determined under the hydrate-vapor two phase region at constant 274.15 K. It was shown that the inhibition effect appeared due to silica gel pores, and the corresponding equilibrium dissociation pressures became higher than those of bulk water hydrates at a specific temperature. In addition, direct measurement of CO2 content in the hydrate phase showed that the retrieved gas from the dissociation of hydrate contained more than 95 mol% of CO2 when 42 mol% of CO2 and balanced H2 mixture was applied. Compared with data obtained in case of bulk water hydrates, which showed just 83 mol% of CO2 where 2-stage hydrate slurry reactor was intended to utilize this property, the hydrate formation in porous silica gel has enhanced the feasibility of CO2 separation process. Hydrate formation as not for slurry but solid particle makes it possible to used fixed bed reactor, and can be a merit of well-understood technologies in the industrial field.