THE ACTIVITY OF THE LIGNITE HYDRO-GASIFICAITON WITH POTASSIUM CATALYST FOR PRODUCTION OF METHANE

摘要

The activity, selectivity and gas release of the lignite hydro-gasification was studied in apressurized fixed bed bench reactor. Under the condition of 4.0MPa, 800°C, the effects oftemperature, pressure and potassium catalyst loadings on reactivity of hydro-gasification oflignite were investigated. The amounts of methane gases produced were significant forcatalytic hydro-gasification, compared to those released in the non-catalytichydro-gasification. In the case of non-catalytic gasification, the contents of CH_4 were in therange of 80–95%. However, in the case of catalytic gasification, the contents of CH_4 wereslightly increased in the range of 92–96%. The temperature of the lignite hydro-gasificationwith potassium catalyst dropped more than 150 °C to achieve the same carbon conversion,compared to the temperature of the lignite hydro-gasification without catalyst. Theexperimental results showed that the potassium catalyst has superior catalysis onhydro-gasification of the lignite, and the carbon conversion of hydro-gasification could be upto 95%. The surface morphology and pore structure of coal samples with potassium catalystloadings had been analyzed using scanning electron microscope (SEM) and gas adsorption/desorption analysis and the results showed that the specific surface areas and total porevolume decrease initially, and then increase with catalyst loadings increasing.