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Directing Activity and Selectivity of Large Pore Acid Zeolites Through the Control of their Physicochemical Properties

  • Avelino Corma
Part of the NATO ASI Series book series (NSSB, volume 221)

Abstract

The catalytic activity and selectivity of zeolites are related to both crystalline structure and chemical composition. Crystalline structure is responsible not only for the so-called shape selectivity, but also will determine the number, accesibility and strength of the active sites due to changes in the T-O-T angles. If one refers to acid zeolites, the deprotonation energy of a bridged hydroxyl group depends on its local geometry, which is determined by the framework structure, and by the possibilities to relax this geometry within the framework subjected to deprotonation1. In this way it has been found that the deprotonation energy decreases with increasing Si-O-Al angles2. Then, when calculations have been made using observed atomic coordinates in HZSM-5, acidity differences of NH3 adsorption over 33 Kcal.mol−1 can be inferred1, for hydroxyl sites on different crystallographic positions3.

Keywords

Acid Site Acid Strength Acid Site Density Ortho Xylene Large Pore Zeolite 
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

  • Avelino Corma
    • 1
  1. 1.Instituto de Catalisis y PetroleoquimicaC.S.I.C.MadridSpain

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