Preparation of biodiesel from rice bran fatty acids catalyzed by heterogeneous cesium-exchanged 12-tungstophosphoric acids

► A simple, efficient and eco-friendly process for biodiesel production is presented. ► Use of eco-friendly solid catalysts that are highly active and reusable. ► Use of low cost crude rice bran oil as feedstock. ► Optimization of reaction conditions and kinetic analysis also presented.