In this study, biomass slagging sintered by gasifier was used as solid base catalyst to catalyze the conversion of oil to biodiesel. The solid base catalyst was characterized, and the effects of molar ratio, reaction temperature, reaction time and catalyst amount on the reaction were investigated. The results show that the main components （calculated as oxides） of biomass slag-forming solid alkali catalyst are： silica （40%-60%,wt）, calcium oxide （10%-20%,wt）, potassium oxide （10%-15%,wt）, magnesium oxide （≤10%,wt）, alumina （≤ 8%,wt）, ferrous oxide （≤4%,wt）, etc. The alkaline concentration is 0.3974 mmol/g, the specific surface area of the catalyst is 1.266 m2/g, and the pore diameter is mainly concentrated in 5-10 nm. Biomass slagging solid alkali catalyst has excellent performance in biodiesel preparation. At the reaction temperature of 200 ℃, the molar ratio of methanol/rapeseed oil is 14∶1, and the catalytic dose is 20%,wt （relative to the mass of rapeseed oil）, reaction time is 8 h, the conversion of biodiesel is more than 95%. After 33 times of continuous use of the catalyst, the biodiesel conversion rate remains above 85% without appreciable loss of catalytic activity, which indicates the catalyst has good reusability. The above study reveals that the biomass slagging sintered catalyst demonstrates promise for producing biodiesel.
Key words
biodiesel /
solid base /
catalyst /
biomass slagging /
transesterification
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