Table 4. Actual and predicted values for the response surface analysis of GC synthesis over the 5%Li/MCM-41 catalyst.

Standard run	Catalyst loading (wt%)		DMC: enriched glycerol molar ratio		Reaction temperature (°C)		Reaction time (min)		GC yield (%)
	Coded	Real	Coded	Real	Coded	Real	Coded	Real	Observed	Predicted
1	−1	3	+1	4 : 1	−1	75	−1	90	36.77	36.71
2	+1	5	+1	4 : 1	−1	75	−1	90	43.62	44.25
3	+1	5	−1	2 : 1	−1	75	+1	150	44.15	43.08
4	+1	5	−1	2 : 1	−1	75	−1	90	42.08	43.00
5	0	4	0	3 : 1	0	80	+2	180	53.75	54.28
6	+1	5	−1	2 : 1	+1	85	−1	90	37.78	38.72
7	0	4	0	3 : 1	0	80	0	120	54.90	55.31
8	+1	5	+1	4 : 1	−1	75	+1	150	46.82	46.92
9	−1	3	−1	2 : 1	−1	75	−1	90	46.34	44.32
10	−1	3	−1	2 : 1	+1	85	−1	90	41.09	40.53
11	0	4	0	3 : 1	+2	90	0	120	48.77	47.72
12	0	4	0	3 : 1	0	80	−2	60	48.16	47.65
13	−1	3	−1	2 : 1	−1	75	+1	150	45.94	45.82
14	−1	3	+1	4 : 1	−1	75	+1	150	41.31	40.81
15	0	4	0	3 : 1	0	80	0	120	55.64	55.31
16	0	4	0	3 : 1	0	80	0	120	55.75	55.31
17	0	4	0	3 : 1	0	80	0	120	56.46	55.31
18	+1	5	+1	4 : 1	+1	85	+1	150	57.18	59.65
19	0	4	0	3 : 1	−2	70	0	120	37.72	38.78
20	−1	3	+1	4 : 1	+1	85	+1	150	55.40	54.03
21	+1	5	+1	4 : 1	+1	85	−1	90	54.86	54.52
22	+2	6	0	3 : 1	0	80	0	120	51.33	49.70
23	0	4	+2	5 : 1	0	80	0	120	46.25	45.02
24	0	4	0	3 : 1	0	80	0	120	55.61	55.31
25	+1	5	−1	2 : 1	+1	85	+1	150	41.64	41.25
26	−2	2	0	3 : 1	0	80	0	120	43.76	45.40
27	−1	3	+1	4 : 1	+1	85	−1	90	45.96	47.48
28	−1	3	−1	2 : 1	+1	85	+1	150	44.67	44.49
29	0	4	0	3 : 1	0	80	0	120	53.51	55.31
30	0	4	−2	1 : 1	0	80	0	120	32.99	34.23