Oyster and Pyramidella Shells as Heterogeneous Catalysts for the Microwave-Assisted Biodiesel Production from Jatropha curcas Oil

Table 2

The physical properties of waste shell-derived catalyst.

Physical property	Derived catalyst
	Oyster shell	Pyramidella shell
Surface area (m^2/g)	24	29
Pore volume (cm^3/g)	0.04	0.06
Mean pore diameter (Å)	66.00	64.15