SCHEDULED MAINTENANCE
Iron-doped Co3O4 catalysts prepared by a surfactant-assisted method as effective catalysts for malic acid oxidative decarboxylation
Gheorghiţa
Mitran, 
*a
Ştefan
Neaţu,
b
Octavian Dumitru
Pavel,
a
Mihaela
Florea
ab
and
Florentina
Neaţu
*b
*a
Ştefan
Neaţu,
b
Octavian Dumitru
Pavel,
a
Mihaela
Florea
ab
and
Florentina
Neaţu
*b
Abstract
Iron-doped Co3O4 oxides prepared by a surfactant-assisted method exhibited good catalytic activity in malic acid conversion, and the oxygen defects associated with the presence of Co2+ played a key role in catalyst activation for pyruvic acid production. The most active catalyst, for which the malic acid conversion was 70% and the pyruvic acid yield was 24%, has an inverse spinel type structure (Fe3+ replaces Co2+ from tetrahedral sites, while Fe2+ replaces Co3+ from octahedral sites) as well as a small energy difference between the highest occupied orbital and the lowest unoccupied orbital (low band-gap, Eg). The catalyst with the highest Co2+ loading showed the highest yield of pyruvic acid.
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