Probing the functionality of nanostructured MnCeOx catalysts in the carbon monoxide oxidation: Part I. Influence of cerium addition on structure and CO oxidation activity

Abstract The effects of cerium addition on the physico-chemical properties and CO oxidation activity of nanostructured MnCeO x catalysts (0 ≤ c Ce  ≤ 1) have been assessed. Irrespective of the loading, cerium hinders any significant long-range crystalline order promoting surface exposure, oxide dispersion, and reducibility of composite catalysts. Noticeable structural effects and strong oxide interaction lead to different arrangement of the active MnO x phase, explaining the peculiar reactivity scale of the studied catalysts in the CO oxidation reaction. High activity, good stability, CO 2 productivity values depending on the MnO x loading, and similar activation energy values in the range of 353–533K (37–47 kJ/mol) uncover an unchanging reaction mechanism, irrespective of composition and temperature. Although some chemical effects at high Ce loading (χ Ce  ≥ 0.5), structure-activity relationships indicate that surface Mn IV centers are the active sites of bulk MnO x and composite MnCeO x catalysts.

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