Fig. 7
From: Optimizing Al/Zn ratios in K2O/Zn-Aluminate catalysts for enhanced biodiesel production efficiency

Reusability of K2O/Zn-4Al2O4 sample for four esterification reaction cycles.
From: Optimizing Al/Zn ratios in K2O/Zn-Aluminate catalysts for enhanced biodiesel production efficiency

Reusability of K2O/Zn-4Al2O4 sample for four esterification reaction cycles.