Fig. 1. Yield of methane in thermodynamic equilibrium for H2/CO2 ratio 4 [8].
Fig. 2. Microscopic image of Ni/γ-Al2O3 particle.
Fig. 3. Schematic diagram of the experimental apparatus.
Fig. 4. Effect of temperature on CO2 conversion (H2/CO2 ratio = 4, 5, P = 1 bar, U0/Umf = 3).
Fig. 5. Effect of pressure on CO2 conversion (H2/CO2 ratio = 4, 5, T = 400 ℃, U0/Umf = 3).
Fig. 6. Effect of H2/CO2 ratio on CO2 conversion (T = 400 ℃, P = 3 bar, U0/Umf = 3).
Fig. 7. Effect of gas velocity (U0/Umf) for CO2 conversion (H2/CO2 ratio = 4, 5, T = 400 ℃, P = 3 bar).
Fig. 8. Gas composition and CO2 conversion of long term test for CO2 methanation at optimal condition (H2/CO2 ratio = 5, T = 400 ℃, P = 1 bar, U0/Umf = 1.4).
Fig. 9. (a) SEM image of Ni/γ-Al2O3 catalyst before methanation. (b) SEM image of Ni/γ-Al2O3 after methanation during 30 h.
Table 1. Characteristics of catalyst and silica sand
Table 2. Summary of test conditions and variables
Table 3. Selectivity and yield with variation of temperature
Table 4. Selectivity and yield with variation of pressure
Table 5. Selectivity and yield with variation of H2/CO2 ratio
Table 6. Selectivity and yield with variation of Uo/Umf
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