All the binders almost have not any catalytic
activity for the transesterification of GL with DMC, in contrast, all
the extruded CaO-based catalysts show high catalytic activity.
However, both the GL conversion and GC yield for all the extruded
CaO-based catalysts are lower than for CaO powder catalyst. The
reason should be that the extruded CaO-based catalysts have far
larger size, and thereby have a higher internal diffusion limitation
than CaO powder catalyst.