Design of Scandium-Doped USY Zeolite: An Efficient and Green Catalyst for Aza-Diels–Alder Reaction

Scandium-exchanged USY zeolites were synthesized by vapor-phase exchange of parent HUSY with scandium trifluoromethanesulfonate (triflate) Sc(OSO2CF3)3. Several FAU zeolites having scandium loadings ranging from 2 to 30 mol % were prepared and applied as catalysts to aza-Diels–Alder reaction in orde...

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Bibliographic Details
Published in:	Journal of physical chemistry. C 2012-06, Vol.116 (25), p.13661-13670
Main Authors:	Olmos, A, Rigolet, S, Louis, B, Pale, P
Format:	Article
Language:	eng
Subjects:	Applied sciences Catalysis Catalysts: preparations and properties Chemistry Condensed matter: structure, mechanical and thermal properties Electronics Exact sciences and technology General and physical chemistry Optoelectronic devices Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Structure and morphology thickness Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Thin film structure and morphology
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Summary:	Scandium-exchanged USY zeolites were synthesized by vapor-phase exchange of parent HUSY with scandium trifluoromethanesulfonate (triflate) Sc(OSO2CF3)3. Several FAU zeolites having scandium loadings ranging from 2 to 30 mol % were prepared and applied as catalysts to aza-Diels–Alder reaction in order to establish structure and catalytic properties relationships. Calcination at 623 K for 72 h led to preservation of the zeolite crystallinity along with the presence of different extra-framework aluminum species (EFAl) and scandium species, thus providing high Lewis acidity. Observation of the catalyst before, during, and after reaction, by multinuclear MAS NMR techniques and H/D isotope labeling, revealed the modification of aluminum and scandium environments within the zeolite framework. Recycling experiments stated for a truly heterogeneous catalytic path over these Sc–USY zeolites. In contrast to the homogeneous version for the aza-Diels–Alder reaction, the present heterogeneous new version provided a green route for quantitative synthesis of tetrahydropyridines via bifunctional heterogeneous catalysis.
ISSN:	1932-7447 1932-7455