Abstract
An ordering of magnesium is observed in the as-synthesized MAPO-36 molecular sieve. Upon calcination, part of the magnesium is removed from the sample and part occupies extraframework positions thus rendering a random distribution of magnesium in the lattice. The shoulder observed in the31P spectrum of the calcined sample is assigned to P(3Al, 1Mg) sites in conflict with the earlier assignment to P-OH groups. The bridging hydroxyl groups located at these sites are detected in the1H MAS spectrum at 3.6 ppm. Further, MAPO-36 catalyzed acetone conversion to mesityloxide that cracked at elevated temperature to yield acetic acid and aliphatics.
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Prasad, S., Barich, D.H. & Haw, J.F. Probing acid sites in MAPO-36 by solid state NMR. Catal Lett 39, 141–146 (1996). https://doi.org/10.1007/BF00805573
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DOI: https://doi.org/10.1007/BF00805573