Evolution of microstructure induced by calcination in leached Al-Cu-Fe quasicrystal and its effects on catalytic activity

Toyokazu Tanabe, Satoshi Kameoka, An Pang Tsai

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23 Citations (Scopus)

Abstract

Effects of calcination on catalytic activity for steam reforming of methanol (SRM) over an Al-Cu-Fe quasicrystal (QC) leached with NaOH aq. have been investigated in terms of microstructure with X-ray diffraction and transmission electron microscope (TEM). Calcination at 600 °C in air drastically improved the catalytic activity of the leached QC. TEM observations on cross-section of the samples revealed that cubic Cu x Fe 3-x-y Al y O4 spinel was formed at the outermost layer of the leached QC after calcinations. Prior to the catalytic reaction, the Cu x Fe3-x-y Al y O4 spinel decomposed to a composite where fine Cu nanoparticles dispersed in (Fe,Al)3O4 matrix under H2 treatment at 300 °C. Drastic increase in catalytic activity is responsible for the fine Cu nanoparticles in the composite. The Cu nanoparticles sit along the same orientation with (Fe,Al)3O4, e.g., Cu [013]//(Fe,Al) 3O4 [013] and Cu [200]//(Fe,Al)3O4 [400]. This orientation relationship may stabilize the Cu nanoparticles through a bonding of Cu-O-Fe.

Original languageEnglish
Pages (from-to)2242-2250
Number of pages9
JournalJournal of Materials Science
Volume46
Issue number7
DOIs
Publication statusPublished - 2011 Apr

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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