Effect of fluorine-containing chiral templates on Mg distribution in the structure of MgAPO-5 and its influence on catalytic activity

MgAPO-5 materials have been synthesized by using three new structure directing agents: S-(−)-1-benzyl-2-pyrrolidinemethanol, and its ortho- and meta-fluoro-benzyl derivatives. Their acidity has been measured and their catalytic activity tested in the cyclohexene oxide opening acid-catalyzed reaction...

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Bibliographic Details
Published in:Catalysis today 2006-05, Vol.114 (2), p.174-182
Main Authors: Gómez-Hortigüela, L., Márquez-Álvarez, C., Sastre, E., Corà, F., Pérez-Pariente, J.
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Enantioselectivity
Exact sciences and technology
General and physical chemistry
Helicoidal arrangement
Magnesium distribution
MgAPO-5
Structure directing effect
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:MgAPO-5 materials have been synthesized by using three new structure directing agents: S-(−)-1-benzyl-2-pyrrolidinemethanol, and its ortho- and meta-fluoro-benzyl derivatives. Their acidity has been measured and their catalytic activity tested in the cyclohexene oxide opening acid-catalyzed reaction. The catalytic activity of these materials can be related to their acidity. It has been found that MgAPO-5 samples synthesized from both fluorinated structure directing agents are much more active as acid catalysts for the reaction. A computational study based on molecular mechanics shows a rigid arrangement of the organic molecules in form of helices of dimers within the AFI structure, and suggests a direction of the fluorinated molecules towards the incorporation of magnesium atoms in the framework.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2006.01.014