Tungsten Oxide

Biodiesel is usually synthesized from vegetable oils and fats and waste edible oils by simple transesterification. In the synthesis of biodiesel, the key technology is the selection of the catalyst, the traditional inorganic acid and alkali catalyst, facing strong corrosive and non renewable, easy to cause problems such as saponification reaction against the original intention of the environmental protection of bio diesel.  Phosphotungstic acid is an environmentally friendly catalyst widely used in catalysis in recent years. It has strong acidity, and many industrial processes that need to be catalyzed by inorganic acids can be replaced by phosphotungstic acid. But in the biodiesel production process, found itself acid soluble in water, for many catalytic processes of catalytic esterification, the esterification rate is generally not high, in addition, the activity of the heteropoly salt group easily lost, so that it can not be used repeatedly, which leads to high cost. Even so, t...