Issue 10, 2001

Structure and redox properties of bulk and supported manganese oxide catalysts

Abstract

The effects of the oxide carrier (γ-Al2O3, SiO2, ZrO2, TiO2), MnOx precursor (KMnO4 , Mn(NO3)2 and Mn(CH3COO)2), loading (2–17 wt.% Mn) and preparation method on the structure and reduction pattern of MnOx-based catalysts have been systematically evaluated by X-ray diffraction (XRD) and temperature programmed reduction (TPR) measurements in the range 273–1073 K. Oxide precursor and preparation method determine both the structure and average oxidation number (A.O.N.) of the MnOx (1.5<x<2) phase in bulk and supported systems. The reducibility scale, based on the inverse sequence of the onset temperature of reduction (To,red),

signals that the reduction pattern of MnOx catalysts depends upon Mn loading and nature of the oxide–support interaction, which control both dispersion and A.O.N. of the active phase.

Article information

Article type
Paper
Submitted
02 Jan 2001
Accepted
19 Mar 2001
First published
12 Apr 2001

Phys. Chem. Chem. Phys., 2001,3, 1911-1917

Structure and redox properties of bulk and supported manganese oxide catalysts

F. Arena, T. Torre, C. Raimondo and A. Parmaliana, Phys. Chem. Chem. Phys., 2001, 3, 1911 DOI: 10.1039/B100091H

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