Progress of Catalytic Valorization of Bio-Glycerol with Urea into Glycerol Carbonate as a Monomer for Polymeric Materials

Table 2

Catalytic glycerolysis of urea to GC using magnesium-based catalyst.

Entry	Catalyst	Acid amount (mmol/g)	Base amount (mmol/g)	Reaction conditions	Yield of GC (%)	Ref.
1	MgO	—^a	—^a	140℃, 5 h	70^b	[82]
2	Combustion synthesized MgO	0.69	0.73	150 ℃, 6 h	71	[91]
3	2.5 wt% Au-MgO	—^a	—^a	150℃, 4 h	73	[95]
4	Au–Pd-MgO	—^a	—^a	150℃, 4 h	67	[96]
5	HT(Mg/Zn/Al)	—^a	—^a	130℃, 3 h	83.7	[97]
6	Mg-Al-Zr	0.119	0.261	140℃, 3 h	87.8	[98]

^aNot reported. ^bGlycerol conversion.