Preparation and characterization of MCM-41 and silica supported nickel boride catalysts

She Tin Wong, Jyh Fu Lee, Jin Ming Chen, Chung Yuan Mou

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Ni-B/MCM-41 and Ni-B/SiO2 catalysts were prepared by low-temperature reduction of surface-adsorbed nickel chloride with ethanolic sodium borohydride solution. XRD analysis showed that the MCM-41 framework of Ni-B/MCM-41 catalyst remained intact, while nitrogen adsorption-desorption study revealed uniform pore size distribution of the channel system. Thermal treatment of this catalyst under nitrogen at 450°C indicated the presence of a segregated nickel phase on the surface of MCM-41. On amorphous silica, however, amorphous nickel boride alloy may have formed. As-synthesized Ni-B/MCM-41 is more susceptible to oxidation than Ni-B/SiO2 probably due to the smaller size of its alloy particles. This suggestion is also supported by the EXAFS results. The lower activity of Ni-B/MCM-41 catalyst than Ni-B/SiO2 in benzene hydrogenation reaction probably reflects the lower reducibility of nickel oxide phase than nickel boride alloy phase.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalJournal of Molecular Catalysis A: Chemical
Volume165
Issue number1-2
DOIs
Publication statusPublished - Jan 8 2001
Externally publishedYes

Keywords

  • Amorphous alloy
  • Benzene hydrogenation
  • MCM-41
  • Nickel boride
  • Sodium borohydride

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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