The stability of catalyst is also an important factor for industrial
application. The U-CaO and M-CaO_100 catalysts were chosen for the
stability test under the optimal reaction conditions. As indicated in
Fig. 8, in the first five cycles, the M-CaO_100 catalyst showed superior
catalytic activity and stability compared to the U-CaO catalyst. In detail,
after the 5th cycle, the FAME yield of the M-CaO_100 catalyst only