MoO3/ZrO2 catalyst

which prepared by solution combustion method

achieved the highest CO methanation activity due to its high surface area and effective MoO3 dispersion on ZrO2 support. By study of sulfidation process on methanantion activity

it was found that sulfidation pressure

time and H2S concentration had little effect but sulfidation temperature had significant effect. For one-step constant temperature sulfidation process

the optimum sulfidation temperature was 300℃. Catalyst characterization showed that isothermal sulfidation at 300℃ produced catalyst with complete sulfidation and many MoS2 crystalline

which is helpful to improve methanation activity. Isothermal sulfidation below 300℃ yielded catalyst with incomplete sulfidation and fewer amounts of MoS2 crystalline while isothermal sulfidation above 300℃ resulted aggregation of MoS2 crystalline

which will deteriorate MoO3/ZrO2 catalyst. For stepwise sulfidation process

the optimum sulfidation temperature was 400℃

which resulted catalyst with nearly same methanation activity as that of one-step isothermal sulfidation at 300℃. Therefore

the suitable sulfidation condition for MoO3/ZrO2 catalyst is determined as 0.1 MPa

isothermal 300℃

3% H2S/H2

and time 4 h.