关键词: 生物柴油, 固体碱催化剂, 钙催化剂

Abstract:

Solid base catalysts used in the transesterification for biodiesel production can simplify the technological processes, especially the separation process of productsBy screening metal oxides, calcium oxide was found to be a potential catalyst for the transesterification of rapeseed oilImpregnating calcium acetate solution onto MgO carrier and calcining the impregnated sample obtained a CaO/MgO catalyst containing 165%(mass) of calcium oxide, which exhibited a high activity in the transesterification reactionBy using this catalyst, under the condition of 64.5℃, a methanol/oil molar ratio of 18∶1 and a catalyst dosage of 2%, oil conversion reached 92% in 3.5 h, which was close to the oil conversion using the traditional NaOHFurthermore, the solid catalysts obtained were characterized with XRD, AAS, XPS and CO2-TPDThe results showed that the basicity of the catalysts greatly affected their activitiesProperly selecting the carrier, precursor and Caloading could increase the strong basic sites, and therefore increase their catalytic activity.

Key words: 生物柴油, 固体碱催化剂, 钙催化剂