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<i>N</i>-Hydroxyphthalimide was immobilized via ester bond on commercially available silica gel (SiOCONHPI) and then coated with various ionic liquids containing dissolved CoCl₂ (SiOCONHPI@CoCl₂@IL). New catalysts were characterized by means of FT IR spectroscopy, elemental analysis, SEM and TGA analysis and used in ethylbenzene oxidation with oxygen under mild solvent-free conditions (80 &#176;C, 0.1 MPa). High catalytic activity of SiOCONHPI was proved. In comparison to a non-catalytic reaction, a two-fold increase in conversion of ethylbenzene was observed (from 4.7% to 8.6%). Coating of SiOCONHPI with [bmim][OcOSO₃], [bmim][Cl] and [bmim][CF₃SO₃] containing CoCl₂ enabled to increase the catalytic activity in relation to systems in which IL and CoCl₂ were added directly to reaction mixture. The highest conversion of ethylbenzene was obtained while SiOCONHPI@CoCl₂@[bmim][OcOSO₃] were used (12.1%). Catalysts recovery and reuse was also studied.