Table 1:

Experimental conditions (combinations of PVF concentration X1, PVF contact time X2, K2PtCl4 contact time X3) and the peak current (Y) of methanol oxidation.
Run Order Combination X1/mM X2/min X3/min Y/A
13 1 2 5 1 3.156
10 2 10 5 1 0.365
2 3 2 15 1 11.07
9 4 10 15 4 1.781
12 5 2 10 0.5 4.534
8 6 10 10 0.5 2.128
4 7 2 10 1.5 4.871
7 8 10 10 1.5 2.793
1 9 6 5 0.5 9.464
11 10 6 15 0.5 7.869
3 11 6 5 1.5 9.457
6 12 6 15 1.5 3.353
14 13* 6 10 1 1.764
5 14* 6 10 1 1.538
15 15* 6 10 1 0.780

* The last three combinations were identical, which is required by the Box-Behnken design. They were actually the "center" of various levels.