Catalysis Letters

, Volume 8, Issue 2–4, pp 145–153 | Cite as

Observations on the synthesis and structure of wide pore aluminum phosphate molecular sieves

  • Jaime O. Perez
  • Nancy K. McGuire
  • A. Clearfield
Article

Abstract

The synthesis of wide pore 18-ring aluminum phosphates has been explored using several amines as templates. The systems studied in more detail involve the use of dipentylamine (DPTA), a combination of tributylamine (TBA) and dipentylamine and dipropylamine (DPA). In the latter two systems a thermally unstable phase with an XRD pattern similar to VPI-5 was obtained which has been identified as the H1 phase. In the DPTA system both thermally stable and unstable phases can be formed, depending on the reaction conditions used. By controlling the gel formation in the DPA system ALPO4-8 was synthesized by hydrothermal methods. The products in the first two cases contain significantly higher amounts of the amine than has been reported in the synthesis of VPI-5. The structure of the thermally unstable H1 phase has been solved from X-ray powder data collected using a synchrotron X-ray source and shown to contain 6-coordinate aluminum in the 4-rings.

Keywords

VPI-5 H1 aluminophosphate synthesis and structure 

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Copyright information

© J.C. Baltzer A.G. Scientific Publishing Company 1991

Authors and Affiliations

  • Jaime O. Perez
    • 1
  • Nancy K. McGuire
    • 1
  • A. Clearfield
    • 1
  1. 1.Department of ChemistryTexas A&M UniversityCollege StationUSA

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