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

Table 1

Chemical compositions of waste shell-derived catalyst.

Compound	Concentration (wt%)
	Oyster shell	Pyramidella shell
CaO	93.83	94.30
SiO2	2.71	3.29
MgO	1.18	0.48
Al2O3	0.78	0.43
Na2O	0.50	0.34
Fe2O3	0.24	0.27
SrO	0.23	0.37
TeO2	0.13	0.14
LOI	0.40	0.38