Solid state 71Ga m.a.s.-n.m.r. spectroscopy on MFI-gallosilicates has shown evidence for the removal of tetrahedrally co-ordinated gallium from the zeolite lattice and the concomitant deposition of octahedrally co-ordinated gallium in the pores during steam treatment.
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Bayense et al. (1989) studied this question.