Table 5.

Examples of few catalysts and conditions studied in the literature.

	Catalyst loading		Catalytic test temperature (°C)	n-Butanol selectivity (%)	References
	mg	wt%
Mg and Al mixed oxides	300		500	>20	[50]
ZrO2-supported Cu	500		300	≥10	[52]
Ni/Al2O3	10–50		250	80	[53]
Hydroxyapatite			350–450	50	[54]
Na to ZrO2		1	340–400	–	[55]
Ni/C-alumina	3000–3500		250	62	[56]
Co2+ + / Ca2+ hydroxyapatite		1.35	120–240	–	[57]
MgO	500		450	–	[44]