Support effect in Co3O4-based catalysts for selective partial oxidation of glycerol to lactic acid

[Display omitted] •CeO2, ZrO2 and TiO2 are used as supports for Co3O4.•Co3O4 supported on CeO2 and ZrO2 are active catalysts for the selective conversion of glycerol to lactic acid.•The support type and acid-base properties influenced the activity and selectivity of Co3O4 derived catalysts.•CeO2 is...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2021-07, Vol.621, p.118199, Article 118199
Main Authors: Torres, Sebastian, Palacio, Ruben, López, Diana
Format: Article
Language:English
Subjects:
Acids
Alcohol valorization
Catalysts
Cerium oxides
Cobalt oxides
Glycerol
Lactic acid
Low temperature
Metal oxides
Oxidation
Selectivity
Spinel Co3O4
Titanium dioxide
Zirconium dioxide
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Summary:[Display omitted] •CeO2, ZrO2 and TiO2 are used as supports for Co3O4.•Co3O4 supported on CeO2 and ZrO2 are active catalysts for the selective conversion of glycerol to lactic acid.•The support type and acid-base properties influenced the activity and selectivity of Co3O4 derived catalysts.•CeO2 is a suitable support for Co3O4 allowing high lactic acid selectivity and glycerol conversion avoiding coke formation. Co3O4 supported on CeO2, ZrO2 and TiO2, were used as catalysts in glycerol partial oxidation to lactic acid. The aim was to establish the influence of the support on the cobalt-derived catalysts activity. The most active catalyst based on TOF followed the order: Co3O4/CeO2 (1.2 × 10−1 s−1) > Co3O4/ZrO2 (8.3 × 10-2 s−1) > Co3O4/TiO2 (3.0 × 10-2 s−1), with lactic acid selectivity at comparable glycerol conversion (53.5 ± 5.5 %) being higher when using CeO2 support, Co3O4/CeO2 (90 %) > Co3O4/ZrO2 (78 %) > Co3O4/TiO2 (68 %). These results indicated that the support type not only influenced activity but also selectivity to lactic acid. The Co3O4/CeO2 catalyst with less exposed cobalt species at the surface enriched in Co3+ ions, a more homogeneous composition of cobalt species being reduced at low temperatures, with acid sites of middle strength and lower density of acidic sites, is at the origin of a greater selectivity towards lactic acid, in addition this catalyst was active in 4 catalytic cycles.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2021.118199