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Iron in various iron-oxide aerogel and xerogel catalyst formulations (≥85% Fe 2 O 3 ; ≤10% K, Co, Cu, or Pd) developed for possible use in Fischer–Tropsch synthesis (FTS) or the water-gas-shift (WGS) reaction has been examined by 57 Fe Mössbauer spectroscopy. The seventeen samples consisted of both as-prepared and calcined aerogels and xerogels and their products after use...
Cobalt catalysts supported on silica aerogel have been prepared using sol–gel chemistry followed by drying under supercritical ethanol conditions. Three different loadings of cobalt were synthesized: 2, 6, and 10% by weight. Transmission electron micrographs indicate that the metallic cobalt exists as discrete particles 50–70nm in diameter for the 2 and 6% loadings. The 10% catalyst shows long needles...
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