Preparation of MoO3/γ-Al2O3 sulfur-resistant methanation catalyst with segmented plasma fluidized bed

Abstract

In order to solve the shortcomings of MoO₃/γ-Al₂O₃ catalyst for sulfur-resistant methanation, a segmented plasma fluidized bed reactor was designed, where plasma discharge zone and the fluidization zone were separated under higher discharge power. At the bed height of 30 mm, the gas velocity of 0.10 m·s⁻¹ can provide a better fluidization state. The suitable discharge results can be achieved when the input power is 27 W and the discharge interval is 2.0 mm. With the extension of catalyst plasma treatment time, the conversion of CO decreases, but the selectivity of CH₄ increases. Combined with N₂ physical adsorption-desorption, XRD, TEM, Raman, TGA and TPR characterization, it was found that the active components of the catalyst are uniformly dispersed on the γ-Al₂O₃ support. After plasma treatment, tetrahedral Mo species was used as the active center, and the interaction between Mo and the carrier was strengthened. It provides a novel approach for preparing catalyst with dielectric barrier discharge (DBD) fluidized bed reactor.