On the incorporation mechanism of B and AI in MFI-type zeolite frameworks
作者： R. de Ruiter , J.C. Jansen , H. van Bekkum
DOI: 10.1016/0144-2449(92)90011-D
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摘要: Abstract The boric acid/borate equilibrium in [B]-MFI-type zeolite synthesis mixtures was studied by attenuated total reflection i.r. and variable temperature (25–150°C) 11B n.m.r. spectroscopy appeared to be dependent on the sodium tetrapropylammonium (TPA) concentrations. It found that boron incorporation MFI structure requires presence of TPA, whereas aluminum does not. T atoms general is discussed relation microenvironment TPA while taking into account coordination numbers basicity oxygen functions developing lattice. can understood maximum amount non-Si per unit cell 8–10 for equal 4 boron.
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