Viability of strontium carbonate-modified Co3O4 catalysts for chlorinated VOCs oxidation

A series of cobalt oxide catalysts modified with strontium carbonate (Sr:Co molar ratios 0.1–0.4) were prepared, characterised using various techniques (N2 physisorption, XRD, SEM, SEM-EDX, H2-TPR, O2-TPD, XPS) and kinetically evaluated in the gas-phase oxidation of vinyl chloride and 1,2-dichloroet...

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Published inJournal of environmental chemical engineering Vol. 12; no. 6; p. 114402
Main Authors Gil-Barbarin, Amaya, Gutiérrez-Ortiz, Jose Ignacio, López-Fonseca, Rubén, de Rivas, Beatriz
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2024
Subjects
1,2-dichloroethane
Catalytic oxidation
Deactivation
Sr-Co catalysts
Surface chlorination
Vinyl chloride
1,2-dichloroethane
Catalytic oxidation
Deactivation
Sr-Co catalysts
Vinyl chloride
Surface chlorination
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Summary:A series of cobalt oxide catalysts modified with strontium carbonate (Sr:Co molar ratios 0.1–0.4) were prepared, characterised using various techniques (N2 physisorption, XRD, SEM, SEM-EDX, H2-TPR, O2-TPD, XPS) and kinetically evaluated in the gas-phase oxidation of vinyl chloride and 1,2-dichloroethane. Initially, the incorporation of strontium enhanced several physico-chemical properties, including increased surface area, reduced crystal size, and a higher amount of surface oxygen species, suggesting improved catalytic performance. However, the Sr-Co catalysts showed relatively poor catalytic stability, with an increase in chlorinated organic species as catalytic activity decreased. The used catalysts exhibited high concentrations of chlorine, particularly on the surface, along with a decrease in surface area and an increase in crystallite size. Additionally, a reduction in surface oxygen species, crucial for pollutant oxidation, was observed. Therefore, this catalytic chlorination, combined with the loss of textural and structural properties, were inferred to be closely related to catalysts deactivation. [Display omitted] •Various SrCO3-modified Co3O4 catalysts were evaluated for Cl-VOC oxidation.•The addition of SrCO3 improved the physico-chemical properties of the catalysts.•Low-temperature activity resulted from the reactant's reaction with SrCO3 phase.•SrCO3's high affinity for Cl species limited Sr-Co composites for Cl-VOC oxidation.
ISSN:2213-3437
DOI:10.1016/j.jece.2024.114402