Biodiesel synthesis over Sr/MgO solid base catalyst

► Sr/MgO catalysts were employed for biodiesel production. ► Calcination temperature and Sr/MgO ratio affect structure and catalytic activity. ► The catalysts possess excellent activity in transesterification of soybean oil. ► 93% FAME yield was achieved in 30 min. ► Biodiesel produced has acceptable qualities according to standard specifications.