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

Table 4

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

Entry	Catalyst	Acid amount (mmol/g)	Base amount (mmol/g)	Reaction conditions	Yield of GC (%)	Ref.
1	MPR[pmim][Cl] + ZnO	—^a	—^a	140℃, 3 h	78.6	[118]
2	PS-(Im)2ZnBr2	0.165	0.66	140℃, 6 h	72.3^b	[119]
3	Q-MMTs	—^a	0.97	145℃, 3 h	80^b	[120]
4	[PS-(Im)2MX2]	6.01	6.67	140℃, 6 h	60.3	[121]

^aNot reported. ^bGC selectivity.