Abstract <p>A series of Ag-containing catalysts for CO oxidation based on CeO₂–Fe₂O₃@SBA-15 composites synthesized by salt encapsulation in the hybrid material Pluronic-P123@SBA-15 was obtained. The effect of a block copolymer of polyethylene glycol and polypropylene glycol Pluronic-P123 inside the SBA-15 structure (ordered mesoporous silicon dioxide) on the distribution and dispersion of the deposited CeO₂ and Fe₂O₃ components is shown. The deposition of cerium and iron oxides on Pluronic@SBA-15 makes it possible to stabilize CeO₂ and Fe₂O₃ in the form of highly dispersed particles evenly distributed on the surface of the carrier. It was shown that the use of CeO₂ and Fe₂O₃ stabilized in the SBA-15 structure makes it possible to increase the activity of Ag-containing catalysts in the CO oxidation reaction compared with the Ag/SBA-15 catalyst.</p>