Characteristics of integral plasma-fluidized bed and preparation of Mo-based catalysts for sulfur-resistant methanation

Integral plasma fluidized bed reactors were designed for catalyst preparation. Fluidization characteristics and discharge performance were investigated. Results indicated that a bed height of 30 mm and a gas velocity of 0.10–0.18 m/s were obtained a better fluidization effect. Input power 8 W could make the discharge more stable in the double dielectric barrier discharge (DDBD) fluidized bed reactor. The preparation of 20% Mo/Al₂O₃ sulfur-resistant methanation catalysts was treated with DDBD fluidized bed reactor. Plasma time treatment was investigated. The highest CO conversion was obtained for a plasma treatment time of 30 min. The highest methane yield was obtained for a 60 min catalyst. The catalyst components were found to be uniformly dispersed in the form of ammonium molybdate on an Al₂O₃ carrier based on N₂ physisorption-desorption, XRD, TGA, Raman, TEM and TPR characterization. This suggests that the DBD fluidized bed may provide a novel route for catalyst preparation.