Hydration of acetylene on Zn- and Cd-zeolites

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11 Citations (Scopus)

Abstract

Zn- and Cd-exchanged derivatives of two rhyolite tuffs of different clinoptilolite contents and Zn-MFI were prepared by conventional ion exchange in aqueous medium and by reacting metal dust with NH4-form zeolites. The sample wafer, containing adsorbed water, was contacted with acetylene in an IR cell at 0.03 bar. The activity of the zeolites was estimated from the formation rate of adsorbed acetaldehyde at 50 °C. The activities paralleled the Zn- or Cd-contents of the clinoptilolite-containing rocks. Cd and Zn metal dust reacted with the NH4-zeolites at about 300 and 440 °C, respectively. The amount of H2 evolved was stoichiometric with the amount of metal cations incorporated. The structure of the Cd- and Zn-clinoptilolite was damaged above 250 °C and completely destroyed above 450 °C. The Zn-MFI preparations were of higher thermal stability than the corresponding clinoptilolites.

Original languageEnglish
Pages (from-to)199-204
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume61
Issue number1-3
DOIs
Publication statusPublished - Jul 18 2003

Keywords

  • Cadmium
  • Clinoptilolite
  • MFI
  • Metal-introduction
  • Stability
  • Zinc

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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