Giuseppe Trunfio - Nanosize Effects, Physicochemical Properties, And Catalytic Oxidation Pattern of the Redox-Precipitated MnCeOx System

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      Publication Details (including relevant citation   information):

      Arena F., Trunfio G., Fazio B., ***** J., Spadaro L. J. Phys.   Chem. C 2009 113 (7).

      Abstract:

    A series of nanostructured MnCeOx catalysts with superior textural and redox properties in comparison to coprecipitated systems was synthesized via the “redox-precipitation” route (Chem. Mater.2007, 19, 2269). Characterization data prove that the redox-precipitated system consists of uniformly sized (d ≈ 20 nm) spherical nanoparticles ensuring large surface area (120-260 m2/g) and pore volume (0.5-0.6 cm3/g), and a regular pore size distribution in a wide range of Mn/Ce ratios (1/3 to 3/1). The lack of long-range crystalline order and a homogeneous chemical composition signal that Mn and Ce oxides form composite nanodomains with a molecular dispersion of the active phase. Superior MnOx accessibility, strong MnOx-CeO2 interaction, and higher average oxidation number of both Mn and Ce ions strongly promote the reactive surface oxygen availability and the CO oxidation activity in the range of 323-423 K, also accounting for the better stability of the redox-precipitated system under reaction conditions.

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