Table 2.

CCD design matrix of coded process variables and corresponding results.

S.N	Run	X1	X2	X3	Y, CO2 Uptake (mmol/g)
					Experimental	Response	Error (%)
1	19	− 1	− 1	− 1	2.3090	2.3559	1.99
2	3	1	− 1	− 1	4.0319	4.0221	0.24
3	11	− 1	1	− 1	2.5805	2.6018	0.82
4	9	1	1	− 1	3.9771	4.1294	3.69
5	18	− 1	− 1	1	2.3635	2.2566	4.52
6	8	1	− 1	1	3.3318	3.3559	0.72
7	13	− 1	1	1	2.2221	2.2773	2.43
8	6	1	1	1	3.2394	3.2380	0.05
9	14	− 1	0	0	2.7215	2.7050	0.61
10	20	1	0	0	4.1834	4.0184	3.94
11	15	0	− 1	0	3.8690	3.9149	1.17
12	16	0	1	0	4.2063	3.9789	5.40
13	17	0	0	− 1	3.8715	3.6608	5.44
14	4	0	0	1	3.1362	3.1654	0.92
15	1	0	0	0	3.8747	3.8461	0.74
16	10	0	0	0	3.7626	3.8461	2.17
17	5	0	0	0	3.7343	3.8461	2.91
18	2	0	0	0	3.8443	3.8461	0.04
19	7	0	0	0	3.6717	3.8461	4.53
20	12	0	0	0	3.8257	3.8461	0.53