Probing acid sites in MAPO-36 by solid state NMR |
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Authors: | S Prasad Dewey H Barich James F Haw |
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Affiliation: | (1) Laboratory for Magnetic Resonance and Molecular Science, Department of Chemistry, Texas A&M University, 77843 College Station, TX, USA |
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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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Keywords: | metal-AlPO4 NMR spectroscopy acid site acetone conversion |
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