Table 2. Statistical Experimental Design Generated from RSM.

		factor 1	factor 2	factor 3	responses
std	run	A: catalyst conc. (ppm)	B: p-NP conc. (ppm)	C: pH	observed conversion efficiency (%)	predicted conversion efficiency (%)
7	1	150	200	8	78	76.8
9	2	100	150	7	62	61.9
11	3	200	50	7	80	80.4
16	4	200	150	7	98	97.2
10	5	300	150	7	45	45.4
14	6	200	150	9	90	90.8
2	7	250	100	6	82	82.6
3	8	150	200	6	85	86.1
18	9	200	150	7	98	99.1
6	10	250	100	8	84	83.1
5	11	150	100	8	74	75.2
20	12	200	150	7	98	98.5
13	13	200	150	5	85	85.2
17	14	200	150	7	98	98.2
1	15	150	100	6	80	80.7
8	16	250	200	8	70	68.4
12	17	200	250	7	68	69.4
19	18	200	150	7	98	98.4
4	19	250	200	6	65	66.4
15	20	200	150	7	98	97.4