Localisation of iron ions in NH_4,Na-Y zeolite: a mossbauer effect study

摘要

Localisation of Fe ions in deep-bed treated NH_4Na-Y zeolite at 830 K, 940 K, and 1050 K, as well as after reduction by hydrogen, and dealumination with subsequent calci- nation is studied by ~57Fe Mossbauer spectroscopy. Most of the incorporated iron is present in the form of octahedrally coordinated ferric species with two distinct sets of hyperfine parameters assigned to atoms inside the zeolite structure and in extraframework positions.