Biodiesel production from soybean oil in subcritical methanol using MnCO3/ZnO as catalyst

- New solid base catalyst MnCO3/ZnO shows high activity for biodiesel production in subcritical methanol.
- Optimum conditions for catalyst preparation and biodiesel production were determined.
- High catalyst activity maintained after reused for 17 cycles.
- Deactivation of the catalyst is discussed.