Optimization Study in Biodiesel Production via Response Surface Methodology Using Dolomite as a Heterogeneous Catalyst

Table 2

Structural properties of the dolomite catalyst determined by XRD.

Samples	Structural
	Phase detected	Crystalline phase^a	Crystallite diameter (nm)^b
Dolomite	CaMg	92.05	96.0
	Ca(CO3)	6.72	22.0
	SiO2	1.22	99.4
D-700°C	MgO	31.52	17.5
	Ca(OH)2	38.75	12.9
	Ca(CO3)	27.56	28.9
	SiO2	2.17	125.4
D-800°C	CaO	23.57	23.8
	MgO	33.57	17.7
	Ca(OH)2	40.41	12.6
	SiO2	2.45	129.1

After Rietveld refinement (wt%) [26], ^bScherrer equation.