Progress in Transesterification Catalyzed by Composite Hydrotalcite

Biodiesel is a green and environmentally friendly renewable energy source and is the preferred alternative to petrochemical diesel. Biodiesel (fatty acid methyl esters) can be obtained by transesterification of vegetable oils, animal oils or used cooking oils with alcohols. The complex oxides of Layered Double Hydroxides (LDHs) were prepared using hydrotalcite as a carrier and loaded with solid alkali, and used as catalysts for the catalytic preparation of biodiesel. The different preparation methods of hydrotalcite are reviewed, its applications are described, the progress of research on hydrotalcite and its use as a carrier in the catalytic preparation of biodiesel is briefly described, and the research prospects of hydrotalcite-based composite oxides are also presented.