Abstract
Synthetic H-ferrisilicate of the pentasil family was studied by means of diffuse reflectance i.r., e.s.r. and luminescence spectroscopies. In this paper it is shown that only a part of the Fe 3+ ions (< 30%) enter the lattice isomorphically replacing silicon ions. The rest of the iron ions are in an extralattice state, perhaps in the form of a Fe 2O 3 microphase in zeolite pores. Extralattice iron ions can be easily reduced to Fe 2+ species. Structural hydroxyl groups connected with Fe 3+ ions in the framework are shown to have bridging structure and to possess strong acidic properties.
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