Table 3.

Reusability of the catalyst for CO transesterification reaction obtained from 25wt% animal teeth and 75wt% animal bone and calcined at 1150 °C.

Recycling	CO FAME yield (wt%)
Fresh catalyst	89.5
Frist recycle	87.56
Second recycle	85.32
Third recycle	82.02
Fourth recycle	78.04
Fifth recycle	72.00