Calcium Oxide Derived from Waste Shells of Mussel, Cockle, and Scallop as the Heterogeneous Catalyst for Biodiesel Production

Table 2

The physical properties of waste shell-derived catalyst.

Physical property	Derived catalyst
	Mussel shell	Cockle shell	Scallop shell
Surface area (m^2/g)	89.91	59.87	74.96
Pore volume (cm^3/g)	0.130	0.087	0.097
Mean pore diameter (Å)	34.55	25.53	30.55