About the Active Phases of KNO3/Mgo for Catalytic Soot Combustion

JIMÉNEZ, R.; GARCÍA, X.; GORDON, A.
Reaction Kinetics and Catalysis Letters 99 281-287, 2010.

DOI: 10.1007/s11144-009-0145-7

Abstract

Reports suggest KNO3 as the active phase for the catalytic combustion of soot, through a redox mechanism with KNO2. Previously, the high activity of KNO3 for coal gasification (mechanism similar to that of soot combustion) was attributed to decomposition into active KxOy (y < x) compounds. In this work, TGA-MS assays of carbothermic reduction using the KNO3/MgO catalyst showed decomposition into NOx, (to which starting of CB combustion is attributed) and potassium oxide, thus disregarding possible redox cycles KNO3/KNO2. Consecutive assays of carbothermic reduction and TPO in a fixed bed reactor showed the potassium oxides as the main active phases of these catalysts.

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