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

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

研究成果: 雜誌貢獻文章同行評審

27 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)159-167
頁數9
期刊Journal of Molecular Catalysis A: Chemical
165
發行號1-2
DOIs
出版狀態已發佈 - 1月 8 2001
對外發佈

ASJC Scopus subject areas

  • 催化
  • 製程化學與技術
  • 物理與理論化學

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