## 2 Results and Discussion
### Ethylbenzene Oxidation
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Entry**} & \multirow{2}{*}{**Catalyst**} & \multirow{2}{*}{**Leading**} & \multirow{2}{*}{**DVS in**} & \multicolumn{2}{c}{**PS-NHPI 1**} & \multirow{2}{*}{**n\({}_{\text{O2}}\)1**} & \multirow{2}{*}{**\(\alpha\)**} & \multirow{2}{*}{**S**EROOM**} & \multirow{2}{*}{**SAF (\%)**} & \multirow{2}{*}{**S**FEGOM**} & \multirow{2}{*}{**TON 1**} \\  & & **(mmol NHPI/g)** & & & & & & & & & & \\ \hline
1 & – & – & – & – & – & – & 0.49 & 3.0 & 57.8 & 12.9 & 29.2 & – \\
2  & PS-NHPI-4 & 217 & 1 & 37–74 & spherical & 0.84 & 5.1 & 29.0 & 12.7 & 58.3 & 3.9 \\
3  & PS-NHPI-4@[emmin][O\(\circ\)SO\({}_{3}\)] & 2.17 & 1 & 37–74 & spherical & 0.90 & 5.5 & 19.1 & 20.4 & 60.5 & 4.1 \\
4  & CoCl2 & – & – & – & – & 0.73 & 4.5 & 46.3 & 22.1 & 31.4 & – \\ \hline
5  & PS-NHPI-1/CoCl2 & 2.60 & 5.5 & 2–15 & irregular & 1.71 & 10.5 & 4.7 & 78.1 & 17.2 & 6.6 \\
6  & PS-NHPI-2/CoCl2 & 2.63 & 1 & 20–170 & irregular & 1.55 & 9.5 & 18.7 & 50.4 & 30.9 & 5.9 \\
7  & PS-NHPI-3/CoCl2 & 2.13 & 1 & 7–74 & spherical & 1.18 & 7.2 & 23.2 & 45.1 & 31.7 & 5.5 \\
8  & PS-NHPI-4/CoCl2 & 2.17 & 1 & 37–74 & spherical & 1.78 & 10.9 & 1.8 & 64.8 & 33.4 & 8.2 \\
9  & PS-NHPI-5/CoCl2 & 1.70 & 2 & 37–74 & spherical & 1.31 & 8.0 & 14.4 & 53.3 & 32.3 & 7.7 \\ \hline
10  & PS-NHPI-1@CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 2.60 & 5.5 & 2–15 & irregular & 1.08 & 6.6 & 12.7 & 73.7 & 11.6 & 4.2 \\
11  & PS-NHPI-2@CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 2.63 & 1 & 20–170 & irregular & 0.99 & 6.1 & 14.6 & 55.5 & 28.3 & 3.8 \\
12  & PS-NHPI-3@CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 2.13 & 1 & 7–74 & spherical & 0.96 & 5.9 & 10.6 & 67.9 & 20.3 & 4.5 \\
13  & PS-NHPI-4@CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 2.17 & 1 & 37–74 & spherical & 1.18 & 7.2 & 5.6 & 76.5 & 16.5 & 5.4 \\
14  & PS-NHPI-5@CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 1.70 & 2 & 37–74 & spherical & 1.08 & 6.6 & 10.3 & 63.9 & 25.8 & 6.3 \\ \hline
15  & CoCl2/[emmin][O\(\circ\)SO\({}_{3}\)] & - & – & – & – & 0.56 & 3.4 & 34.3 & 23.5 & 39.5 & – \\
16  & PS-NHPI-4/CoCl2 [emmin][O\(\circ\)SO\({}_{3}\)] & 2.17 & 1 & 37–74 & spherical & 1.13 & 6.9 & 23.3 & 35.7 & 40.0 & 5.2 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Effect of the PS-NHPI/CoCl2 and PS-NHPI@CoCl2@ll systems on ethylbenzene oxidation. The results presented in Table 3 illustrate that higher content of the DVB cross-linker leads to lower TONs (entries 5,8,9). Similar results were obtained in [24], where the authors determined that higher DVB content may hinder the reagent's access to the catalytic active centers. Accordingly, the lowest TON (6.6) calculated in this study was recorded for the PS-NHPI-1 catalyst, which had the highest DVB content. In terms of the PS-NHPI/CoCl\({}_{2}\) systems (Table 3, entries 5-9), mixtures of ethylbenzene hydroperoxide, acetophenone, and 1-phenylethanol products were obtained, with a preference toward ketone production (selectivity from 45.1% to 78.1%). For the PS-NHPI-4 and PS-NHPI-5 catalysts, which were characterized by a regular grain shape and a similar size (see Figures S9 and S10), the presence of a greater amount of cross-linking agent allowed higher selectivity (by approx. 12%) toward production of ethylbenzene hydroperoxide. This may indicate a reduction in the contact between the hydroperoxide and CoCl\({}_{2}\) due to weaker binding of the cobalt(II) salt to the catalyst surface. Next, the influence of the [emim][OcOSO\({}_{3}\)] ionic liquid layer on the activity of studied systems was determined. First, we observed that coating the most active heterogeneous catalyst PS-NHPI-4 with a layer of [emim][OcOSO\({}_{3}\)] ionic liquid barely affected its activity (Table 3, entries 2,3). The similar conversions of ethylbenzene (approx. 5%) carried out in these two cases suggest that the ionic liquid does not limit the contact between the reactant and the active centers of the NHPI catalyst (i.e., \(-\)NOH groups).