Tandem Base-Metal Oxide Catalyst for Automotive Three-way Reaction: MnFe.sub.2O.sub.4 for Preferential Oxidation of Hydrocarbon

A combination of two base-metal oxides in tandem configuration can realize three-way reaction without platinum group metals. For this purpose, catalysts for hydrocarbon preferential oxidation (HC-PROX) and for NO reduction by CO are required. For the design of HC-PROX catalysts, competitive oxidatio...

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Bibliographic Details
Published inCatalysis Surveys from Asia Vol. 27; no. 1; p. 48
Main Authors Maruichi, Keisuke, Sakai, Ryosuke, Ueda, Kakuya, Oda, Akira, Satsuma, Atsushi
Format Journal Article
LanguageEnglish
Published Springer 01.03.2023
Subjects
Olefins
Oxidation-reduction reaction
Spinel group
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Summary:A combination of two base-metal oxides in tandem configuration can realize three-way reaction without platinum group metals. For this purpose, catalysts for hydrocarbon preferential oxidation (HC-PROX) and for NO reduction by CO are required. For the design of HC-PROX catalysts, competitive oxidation of propene and CO on spinel-type MFe.sub.2O.sub.4 (M = Co, Cu, Mg, Mn, Ni, Zn) was investigated. MnFe.sub.2O.sub.4 preferentially oxidized propene in the co-presence of CO showing the best propene oxidation activity. Among the series of MFe.sub.2O.sub.4, the activity controlling factor was correlated to the M-O bond energy of the second metal oxides, and the preference for HC oxidation was dependent on the electronegativity of the second ion. A tandem catalyst using MnFe.sub.2O.sub.4 for HC-PROX and CuCo.sub.2O.sub.4 for NO-CO reaction showed TWC activity comparable to a Rh/CeO.sub.2.
ISSN:1571-1013
DOI:10.1007/s10563-022-09373-9