## 2 Results and Discussion
### Ethylbenzene Oxidation
The presence of a wide band at 3373 cm\({}^{-1}\) (v\({}_{\text{OH}}\)) indicates the presence of the N-OH group, the intense band at around 1716 cm\({}^{-1}\) (v\({}_{\text{C=O}}\)) is evidence of carbonyl groups, and the band at around 1236 cm\({}^{-1}\) (v\({}_{\text{C-O}}\)) confirms the presence of an ester group. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Entry** & **Cycle** & **Catalyst** & **Loading** & **DVB in** & **PS-NHPI** & **\(\alpha\)** & **SeBOOH** & **SAP** & **SPOH** \\  & & **(mmol NHPI/g)** & **resin (\%)** & **Size (\%)** & **Shape * (\%)** & **(\%)** & **(\%)** & **(\%)** & **(\%)** \\ \hline
1* & 1 & & & & & & & 10.5 & 47 & 78.1 & 17.2 \\
2 & 2 & PS-NHPI-1/CoCl\({}_{2}\) & 2.60 & 5.5 & 2-15 & irregular & 7.8 & 13.6 & 54.3 & 32.0 \\  & 3 & & & & & & 6.5 & 26.8 & 40.5 & 32.7 \\ \hline
4* & 1 & & & & & & & 9.5 & 18.7 & 50.4 & 30.9 \\
5 & 2 & PS-NHPI-2/CoCl\({}_{2}\) & 2.63 & 1 & 149-297 & spherical & 6.2 & 37.8 & 36.1 & 26.1 \\
6 & 3 & & & & & & 4.6 & 40.5 & 35.4 & 24.1 \\ \hline
7* & 1 & & & & & & & 7.2 & 23.2 & 45.1 & 31.7 \\
8 & 2 & PS-NHPI-3/CoCl\({}_{2}\) & 2.13 & 1 & 74-149 & spherical & 7.1 & 28.7 & 36.7 & 34.6 \\  & 9 & 3 & & & & & 4.3 & 35.3 & 38.5 & 26.2 \\ \hline
10* & 1 & & & & & & 10.9 & 1.8 & 64.8 & 33.4 \\
11 & 2 & PS-NHPI-4/CoCl\({}_{2}\) & 2.17 & 1 & _37-74_ & spherical & 5.9 & 31.1 & 39.2 & 29.7 \\  & 12 & 3 & & & & & 4.2 & 45.7 & 30.3 & 24.0 \\ \hline
13* & 1 & & & & & & 8.0 & 14.4 & 53.3 & 32.3 \\
14 & 2 & PS-NHPI-5/CoCl\({}_{2}\) & 1.70 & 2 & _37-74_ & spherical & 6.1 & 15.6 & 50.6 & 32.5 \\  & 3 & & & & & 7.2 & 13.4 & 49.8 & 36.8 \\
16 & 4 & & & & & & 5.8 & 19.1 & 45.3 & 35.6 \\ \hline
17b & 1 & & & & & & & 6.6 & 12.7 & 73.7 & 11.6 \\
18 & 2 & PS-NHPI-1@CoCl\({}_{2}\)@[emim][OCOSO] & 2.60 & 5.5 & 2-15 & irregular & 6.1 & 13.2 & 71.2 & 15.6 \\  & 9 & 3 & & & & 5.2 & 18.5 & 69.4 & 10.3 \\ \hline
20b & 1 & & & & & & & 6.1 & 14.6 & 55.5 & 28.3 \\
21 & 2 & PS-NHPI-2@CoCl\({}_{2}\)@[emim][OCOSO]\({}_{3}\) & 2.63 & 1 & 149-297 & spherical & 5.8 & 18.9 & 49.5 & 30.7 \\  & 22 & 3 & & & & & 5.4 & 19.3 & 50.6 & 30.1 \\ \hline
23b & 1 & & & & & & 5.9 & 10.6 & 67.9 & 20.3 \\
24 & 2 & PS-NHPI-3@CoCl\({}_{2}\)@[emim][OCOSO]\({}_{3}\) & 2.13 & 1 & 74-149 & spherical & 5.7 & 9.0 & 68.0 & 22.5 \\  & 25 & 3 & & & & & 5.4 & 10.9 & 66.2 & 22.4 \\ \hline
26b & 1 & & & & & & 7.2 & 5.6 & 76.5 & 16.5 \\
27 & 2 & PS-NHPI-4@CoCl\({}_{2}\)@[emim][OCOSO]\({}_{3}\) & 2.17 & 1 & _37-74_ & spherical & 6.5 & 7.6 & 70.5 & 21.1 \\  & 28 & 3 & & & & & 6.7 & 7.1 & 63.9 & 28.4 \\ \hline
29b & 1 & & & & & & 6.6 & 10.3 & 64.1 & 25.6 \\
30 & 2 & PS-NHPI-5@CoCl\({}_{2}\)@[emim][OCOSO]\({}_{3}\) & 1.70 & 2 & _37-74_ & spherical & 6.1 & 11.9 & 57.7 & 30.4 \\  & 31 & 3 & & & & & 5.6 & 13.5 & 54.5 & 32.0 \\ \hline
32c & 1 & & & & & & & 6.5 & 10.3 & 64.1 \\
33d & 1 & PS-NHPI-4 & 2.17 & 1 & _37-74_ & spherical & 5.1 & 29.0 & 12.7 & 58.3 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Recovery and recycling of PS-NHPI/CoCl\({}_{2}\) and PS-NHPI@CoCl\({}_{2}\)@IL systems. The results presented in Table 4, entries 17-31, illustrate that it is possible to recycle the PS-NHPI@CoCl\({}_{2}\)@[emim][CoCOSO\({}_{3}\)] systems while suffering only a slight decrease in overall catalytic activity and selectivity toward acetophenone production. For example, the conversions achieved by PS-NHPI-3@CoCl\({}_{2}\)@[emim][CoCOSO\({}_{3}\)] decreased from 5.9% \(>\) 5.7% \(>\) 5.4%, in the 1 st, 2 nd, and 3 rd reaction cycles, respectively. The system's selectivity toward producing acetophenone over those three cycles remained essentially constant, and it was as high as 66.2% in the third reaction cycle. None of the PS-NHPI@CoCl\({}_{2}\)@[emim][CoCOSO\({}_{3}\)] systems showed the significant increase in selectivity toward ethylbenzene hydroperoxide in subsequent reaction cycles, as was observed for the PS-NHPI/CoCl\({}_{2}\) systems without IL.