Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 35-6, Issue -, Pages 471-481Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1387-1811(99)00243-7
Keywords
aluminophosphates; ESR; metal aluminophosphates; MnAPO-11; MnAPO-41; MnSAPO-41
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Manganese-incorporated aluminophosphate molecular sieves, MnAPO-11, MnAPO-41 and MnSAPO-41, were prepared by hydrothermal methods. The samples were characterized by the techniques of X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric/differential thermal analysis (TGA/DTA), magic-angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy (P-31 and Al-27) and electron spin resonance (ESR) spectroscopy. Thermal analysis data reveal that complete oxidation of the template takes place at higher temperatures in the manganese-containing samples than in the AlPO(4)s. The greater difficulty in template removal from manganese-containing samples is attributed to the presence of protonated template ions compensating the negative charge created by manganese present in the framework. ESR studies reveal that a larger fraction of the manganese in AlPO4-11 is present in the framework than in AlPO4-41. At least four different Mn2+ species in both framework and extraframework positions could be identified in the samples. (C) 2000 Elsevier Science B.V. All rights reserved.
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