Various Cd-zeolite preparations, containing adsorbed water in controlled amounts, were 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 detected by FTIR. Cd-derivatives of MOR, MFI, and clinoptilolite were prepared by conventional ion exchange and by a novel method which is based on redox reaction between zerovalent cadmium atoms and zeolitic lattice protons upon heating the mixtures of Cd dust and NH4-form of zeolites up to 350 °C. Samples partially ion exchanged in aqueous medium were more active in the formation of acetaldehyde than those which were obtained via solid-state reaction and contained more Cd in the cationic sites of these zeolites. For preparation of Cd-FER, however, the latter method was found to be applicable more advantageously. Cd-X,FAU could not be prepared with Cd dust because of crystal collapse below the temperature of the solid-state redox reaction (in this case at low temperature the so called contact induced ion exchange method was applied using Cd-(NO3)2 ). The activities of Cd 2+ cations are quite different in different zeolites prepared similarly.
- Acetylene hydration
- Solid state ion-exchange reactions
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry