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Journal of Thermal Analysis and Calorimetry

, Volume 87, Issue 2, pp 417–422 | Cite as

Acid properties of semicrystalline zeolitic mesoporous UL-ZSM-5 materials

  • A. Ungureanu
  • H. V. Thang
  • D. Trong On
  • E. Dumitriu
  • S. Kaliaguine
regular

Abstract

UL-ZSM-5 materials have been prepared by templated solid-state crystallization of zeolites starting from the amorphous mesostructured aluminosilicate Al-Meso. Microcalorimetry and FTIR have been employed to characterize their surface acidity. In good agreement with 27Al MAS NMR data, UL-ZSM-5 displayed an improved density and strength of Brönsted acid sites, as compared to Al-Meso, owing to the incorporation of aluminium in a tetrahedral environment similar to that of zeolite ZSM-5. Moreover, they showed an enhanced Brönsted/Lewis relative acid ratio. However, Al-Meso showed the highest concentration of strong Lewis acid sites due to its largest amount of aluminium in extraframework positions.

Keywords

acidity FTIR mesoporous molecular sieves microcalorimetry UL-zeolites zeolites 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • A. Ungureanu
    • 1
    • 2
  • H. V. Thang
    • 1
  • D. Trong On
    • 1
  • E. Dumitriu
    • 2
  • S. Kaliaguine
    • 1
  1. 1.Department of Chemical EngineeringLaval UniversitySte Foy, QuébecCanada
  2. 2.Laboratory of CatalysisTechnical University of IasiIasiRomania

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