Structured cobalt–manganese oxides on SiC nano-whisker modified SiC foams for catalytic combustion of toluene

Yanan Guan, Yangtao Zhou, Shaogang Wang, Run Zou, Jinsong Zhang, Xiaolei Fan, Yilai Jiao

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

Abstract

This work presents a two-step method for preparing structured Cobalt-Manganese Oxides nano-sheet (CMO) on SiC nano-whisker (SNW) modified SiC foam support (i.e. CMO@SNW@SiC) and its application to catalytic combustion of toluene. Firstly, SiC nano-whiskers were synthesized on the surface of SiC foam via carbothermal reduction to increase the specific surface area of the resulting structured support (SNW@SiC). Then, CMO were grown on SNW@SiC by hydrothermal synthesis. SNW@SiC provide more surface area, and the nano-sized SiO2/SiCxOy layer on the surface of the SNW promotes the redox reaction of the reactants on the surface, thereby ensuring the directional growth of CMO on SNW@SiC. Compared to the bare SiC foam, CMO loading was increased 67.5% on SNW@SiC. Analysis methods such as H2-TPR, O2-TPD and XPS prove that the redox ability of the CMO on SNW is similar to that of the powder CMO. Toluene catalytic combustion was used as a probe reaction to evaluate catalytic activity. The results show that the CMO@SNW@SiC catalyst could lower the light-off temperature compared to the CMO supported on SiC foam catalyst, which was equivalent to the bulk catalyst (CMO-24h). At the same time, in comparison with the bulk CMO catalyst, the CMO@SNW@SiC catalyst possessed a higher geometric external surface area, which promoted complete conversion of toluene at lower temperatures. In addition, the stability test shows that the CMO@SNW@SiC catalyst also had very good thermal stability and hydrothermal stability as well. The work provided not only the highly performed catalytic oxidation catalyst, but also presented a generic strategy for improving the design of structured catalysts.

Original languageEnglish
Pages (from-to)659-669
Number of pages11
JournalChemical Engineering Research and Design
Volume177
DOIs
Publication statusPublished - Jan 2022
Externally publishedYes

Keywords

  • Catalytic combustion
  • Cobalt–manganese oxides
  • Porous SiC foam
  • SiC nano-whiskers
  • Structured catalyst

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)

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