A sustainable process for biodiesel production using Zn/Mg oxidic species as active, selective and reusable heterogeneous catalysts

Bioresources and Bioprocessing

Table 2 Textural properties and chemical composition of the prepared catalysts

Catalyst	S_BET (m²/g)	V_pore (cm³/g)	d_pore (Å)		MgO (wt%)^a	MgO (wt%)^b	ZnO (wt%)^a	ZnO (wt%)^b	Zn/Mg^c	Zn/Mg^d
Catalyst	S_BET (m²/g)	V_pore (cm³/g)	Mesopores	Macropores	MgO (wt%)^a	MgO (wt%)^b	ZnO (wt%)^a	ZnO (wt%)^b	Zn/Mg^c	Zn/Mg^d
MgO/γ-Al₂O₃	223	0.43	32	57	6.85	nd	–	–	–	–
0.5 Zn/Mg	168	0.32	36	57	4.67	4.14	4.61	5.72	0.5	0.68
1 Zn/Mg	232	0.35	37	51	3.42	3.81	6.26	5.47	1.0	0.71
1.5 Zn/Mg	266	0.41	37	52	2.74	3.15	8.30	9.21	1.5	1.45
2 Zn/Mg	182	0.39	37	51	2.28	1.82	9.22	6.22	2.0	1.69
ZnO/γ-Al₂O₃	173	0.42	32	67	–	–	13.83	nd	–	–
γ-Al₂O₃	216	0.45	nd	75	–	–	–	–	–	–