basic evidence of the molecular dispersion of mnceox catalysts synthesized via a novel...

2007 Catalysts H 2000 Basic Evidence of the Molecular Dispersion of MnCeOx Catalysts Synthesized via a Novel "Redox-Precipitation" Route. — The title catalysts with a (quasi)molecular dispersion of the active phase and enhanced textural properties in comparison to the conventional coprecipitation method are synthesized by titration of an aqueous KMnO4 solution (10% stoichiometric excess) with a solution of Ce(NO3)3 and Mn(NO3)2 (pH 8.0 adjusted with 0.2M KOH, 333 K) followed by calcination of the precipitate in air at 673 K for 6 h. The samples are characterized by XRD, TEM, XPS, and micro- -Raman spectroscopy. The redox-precipitation route greatly promotes the redox behav- ior and the surface affinity toward gas phase oxygen of the MnCeOx system irrespective of the Mn/Ce ratio (0.33—2.1). — (ARENA*, F.; TRUNFIO, G.; NEGRO, J.; FAZIO, B.; SPADARO, L.; Chem. Mater. 19 (2007) 9, 2269-2276; Dip. Chim. Ind., Univ. Messina, I-98168 Messina, Italy; Eng.) — W. Pewestorf 30- 012

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Page 1: Basic Evidence of the Molecular Dispersion of MnCeOx Catalysts Synthesized via a Novel “Redox-Precipitation” Route

2007

CatalystsH 2000 Basic Evidence of the Molecular Dispersion of MnCeOx Catalysts Synthesized via

a Novel "Redox-Precipitation" Route. — The title catalysts with a (quasi)molecular dispersion of the active phase and enhanced textural properties in comparison to the conventional coprecipitation method are synthesized by titration of an aqueous KMnO4 solution (10% stoichiometric excess) with a solution of Ce(NO3)3 and Mn(NO3)2 (pH 8.0 adjusted with 0.2M KOH, 333 K) followed by calcination of the precipitate in air at 673 K for 6 h. The samples are characterized by XRD, TEM, XPS, and micro--Raman spectroscopy. The redox-precipitation route greatly promotes the redox behav-ior and the surface affinity toward gas phase oxygen of the MnCeOx system irrespective of the Mn/Ce ratio (0.33—2.1). — (ARENA*, F.; TRUNFIO, G.; NEGRO, J.; FAZIO, B.; SPADARO, L.; Chem. Mater. 19 (2007) 9, 2269-2276; Dip. Chim. Ind., Univ. Messina, I-98168 Messina, Italy; Eng.) — W. Pewestorf

30- 012

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