Synthesis and Surface Acidity of MeAPO‐5 Molecular Sieves
- 1 June 1988
- journal article
- research article
- Published by Wiley in Journal of the Chinese Chemical Society
- Vol. 35 (3) , 199-205
- https://doi.org/10.1002/jccs.198800029
Abstract
Metal substituted aluminum phosphate molecular sieves, MeAPO‐5 (Me = Co, Mn, Fe(II), Fe(III), and Mg) were synthesized and characterized with X‐ray diffraction and scanning electron microscopy. The acidity was determined by temperature programmed desorption of ammonia, Desorption peaks at around 200°C were observed for all the MeAPO samples studied. Additional desorption peaks at around 300°C were found in MnAPO‐5, CoAPO‐5, and MAPO‐5. MnAPO‐5, CoAPO‐5, and MAPO‐5 also show good activities toward the cracking reaction of cumene at 350°C, while Fe(II)APO‐5 and Fe(III)APO‐5 show some activity at 500°C. The order of the cracking activity correlates with the presence of strong acidic sites in MnAPO‐5, CoAPO‐5, and MAPO‐5 as indicated by the TPD of ammonia.Keywords
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