Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 5, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.108328
Keywords
Formaldehyde oxidation; Earth-abundant catalyst; Cobalt-based oxide; Substitutional doping; Oxygen vacancy
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Funding
- Special Support Plan for National 10000 -talents Program
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This study investigates the catalytic activity of carbon-supported Co(3_x)Mn(x)O4 catalyst for formaldehyde oxidation. The incorporation of Mn ions into Co3O4 lattice significantly enhances the catalytic activity and stability of the catalyst, resulting in a ten-fold higher mass-specific activity compared to Co3O4/C. The proposed mechanism for formaldehyde oxidation over Co3_xMnxO4/C catalyst is based on in situ diffused reflectance infrared spectroscopy results.
Cobalt-based oxides are appealing but less-well investigated catalytic materials for formaldehyde (HCHO) oxidation. We herein report a careful study of carbon-supported Co(3_x)Mn(x)O4 catalyst, with special focuses on the incorporation of Mn ions into Co3O4 lattice and its effect on the catalytic activity for HCHO oxidation. The Co3_xMnxO4/C catalysts were fabricated using a co-precipitation method followed by annealing treatment. A combination of phase structure/chemical structure analyses and control experiments confirmed the substitu-tional doping of Mn ions in Co3O4 lattice, which resulted in increment of oxygen vacancy concentration. Benefiting from Mn-doping and the dispersion effect of carbon, the Co2.7Mn0.3O4/C catalyst prepared under optimal conditions exhibited an impressively high activity for HCHO oxidation, fairly good stability and excellent moisture tolerance. For instance, it enabled a 100% HCHO conversion at 90 C with a ten-fold higher mass -specific activity compared to Co3O4/C. A possible mechanism describing the HCHO oxidation over Co3_xMnxO4/C catalyst was proposed based on the in situ diffused reflectance infrared spectroscopy results.
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