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Effects of substitution in SAPO-n Frameworks on their Properties as Acid Catalysts

  • Machteld Mertens
  • Johan A. Martens
  • Piet J. Grobet
  • Peter A. Jacobs
Part of the NATO ASI Series book series (NSSB, volume 221)

Abstract

Various similarities exist between the oxygen chemistry of phosphorus and silicon. The synthetic aluminophosphates are numerous, and may sometimes resemble aluminosilicates. Besides, mineral silicates exist in which (SiO4) is isomorphously replaced by (PO4)1. Barrer and Marshall2,3 found that aluminophosphates often co-precipitate with aluminosilicates but could not find any evidence for the crystallization of silicoaluminophosphate frameworks. Phosphate-rich hydrous aluminosilicate gels crystallize as separate aluminosilicates and aluminophosphates, with no observable isomorphous substitution2. Kühl4,5 also never encountered phosphate substitution in the zeolite framework when using phosphate as a complexing agent or as a buffer in the synthesis mixture. The aim of such research was primarily to synthesize zeolite structures with increased SiO2/Al2O3 ratios by using complexing agents for Al. No evidence was obtained for the substitution of P for Si.

Keywords

Aluminium Isopropoxide sUbstitution Mechanism Synthesis Mixture Aluminosilicate Zeolite Siliceous Domain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1990

Authors and Affiliations

  • Machteld Mertens
    • 1
  • Johan A. Martens
    • 1
  • Piet J. Grobet
    • 1
  • Peter A. Jacobs
    • 1
  1. 1.Laboratorium voor OppervlaktechemieK.U. LeuvenHeverleeBelgium

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