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Further evidence of incorporation of chromium ions into the framework of silicoaluminophosphate molecular sieves

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Abstract

Three different molecular sieves were synthesised and characterized using31P and27Al magic angle spinning nuclear magnetic resonance (31P and27Al MAS NMR) spectroscopy and acidity measurement techniques. The synthesized solids were: a silicoaluminophosphate (SAPO-11) sample, a chromium-substituted silicoaluminophosphate (CrAPSO-11) sample and a chromium-supported SAPO-11 (Cr/SAPO-11) sample. Significant differences were observed between the CrAPSO-11 MAS NMR spectra and the spectra for the other two solids. The differences can be understood in terms of a different chemical environment for the Al(III) and P(V) ions in the molecular sieve framework, as a result of a different type of interaction, probably with substituted chromium ions in the framework. The acidity measurements were in agreement with the MAS NMR spectroscopy results, providing further evidence for the incorporation of chromium ions into the molecular sieve framework.

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Authors and Affiliations

  1. Centro de Catálisis, Petróleo y Petroquímica, Escuela de Química, Facultad de Ciencias, Universidad Central de Venezuela, Apartado Postal 47102, Los Chaguaramos, 1020-A, Caracas, Venezuela

    J. Goldwasser, F. J. Machado, B. Méndez & C. M. López

  2. INTEVEP, S.A, Apartado 76343, 1070-A, Caracas, Venezuela

    M. M. Ramirez

Authors
  1. J. Goldwasser
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  2. F. J. Machado
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  3. B. Méndez
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  4. C. M. López
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  5. M. M. Ramirez
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Goldwasser, J., Machado, F.J., Méndez, B. et al. Further evidence of incorporation of chromium ions into the framework of silicoaluminophosphate molecular sieves. React Kinet Catal Lett 67, 365–370 (1999). https://doi.org/10.1007/BF02475785

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  • DOI: https://doi.org/10.1007/BF02475785

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