How do Core–Shell Structure Features Impact on the Activity/Stability of the Co-based Catalyst in Dry Reforming of Methane?

Yijun Pang, Aihua Zhong, Zhijia Xu, Wu Jiang, Lingli Gu, Xinzhen Feng, Weijie Ji*, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Dry reforming of methane has been systematically investigated over a series of x-Co@SiO2-y catalysts where x is the Co particle size ranging from 11.1 to 121.3 nm while y denotes the silica shell thickness ranging from 6.0 to 21.9 nm. Various techniques including TEM, XRD, H2-TPR/-TPD, XPS, BET, O2-TPO, TG, and H2-TPSR-MS were employed to characterize physicochemical properties of catalysts. H2-TPR and XPS results indicate that the core–shell interaction is dependent on the core size: the smaller the Co particle size is; the stronger the core–shell interaction. The investigations employing H2-TRSR-MS and XPS on the spent catalysts demonstrated that a fraction of metallic Co was re-oxidized on a large-core catalyst such as 121.3-Co@SiO2-72.2 during the reaction, and such oxidation leads to lower catalytic activity and stability. O2-TPO results indicated that the catalyst with smaller core size caused significant coking. TG analysis together with TEM investigation on the used samples suggested that carbon deposition is notably core-size-dependent and responsible for deactivation of the small-core catalyst. Among various core–shell structured catalysts, 27.8-Co@SiO2-14.3 showed superior activity and durability, owing to the well-balanced property between coking and anti-oxidation of Co cores.

Original languageEnglish
Pages (from-to)2845-2857
Number of pages13
JournalChemCatChem
Volume10
Issue number13
DOIs
Publication statusPublished - 9 Jul 2018

Scopus Subject Areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

User-Defined Keywords

  • cobalt
  • core–shell structure
  • nanocatalyst
  • nanomaterials
  • silicon dioxide

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