LAUSR

Abstract Three different MFI type zeolites Silicalite-1, ZSM-5 and TS-1 as supports were synthesized by steam-assisted crystallization method. Then, the as-synthesized zeolites were used to prepare Co3O4 supported MFI type zeolite catalysts by wet impregnation. The as-prepared Co3O4 supported MFI type zeolite catalysts possessed high specific surface area, abundant pore structure and surface acidity. Finally, the as-prepared catalysts were used for dichloromethane (DCM) catalytic combustion and the results showed that Co3O4 supported MFI type zeolite catalysts had better performance than pure Co3O4. The synergistic catalytic effects between MFI type zeolite and Co3O4 effectively reduced the formation of polychlorinated by-products and suppressed the deactivation of catalyst during the catalytic combustion of DCM. And Co3O4/ZSM-5 catalyst exhibited the best performance due to its proper Bronsted acid sites amount and the T90 (the reaction temperature at which the dichloromethane conversion reached 90%) was 370 °C at 1000 ppm DCM, 10% O2/N2 and the gas hourly space velocity of 30,000 mL/(g∙h).