Fine-tunable Ni@porous silica core-shell nanocatalysts: Synthesis, characterization, and catalytic properties in partial oxidation of methane to syngas

Lei Li, Shengchao He, Yanyan Song, Jing Zhao, Weijie Ji*, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

125 Citations (Scopus)

Abstract

Ni nanoparticles (NPs) of narrow size distribution encapsulated inside meso- and microporous silica were prepared through in situ reduction of NiO NPs coated with silica. By varying preparation parameters, the mean size of Ni NPs can be fine-tuned in the range 6-45 nm. It was found that with variation in core size, microcapsular cavity, and shell porosity, the as-obtained Ni@meso-SiO 2 catalysts for the partial oxidation of methane to synthesis gas are notably different in catalytic activity and durability. The catalyst activity and durability are essentially determined by the size of the Ni cores, and also somewhat by the porosity of SiO 2 shells, as well as the extent of core-shell interaction, which is influenced by the microcapsular cavity structure. The Ni-350@meso-SiO 2 catalyst with Ni NPs of ca. 6 nm and SiO 2 shells with 3-4 nm mesopores is superior in both activity and durability, giving CH 4 conversion of ∼93%, H 2 selectivity of 92-93% (750 °C and GHSV = 72,000 mL g -1 h -1), and TOF CH4 of 37.9 s -1.

Original languageEnglish
Pages (from-to)54-64
Number of pages11
JournalJournal of Catalysis
Volume288
DOIs
Publication statusPublished - Apr 2012

Scopus Subject Areas

  • Catalysis
  • Physical and Theoretical Chemistry

User-Defined Keywords

  • Core-shell structure
  • Ni nanoparticles
  • Ni@porous silica
  • Partial oxidation of methane
  • Silica

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