1. Hydrogenation Size‐Selective Pt/Hollow Beta Catalysts.
- Author
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Morgado Prates, Ana Rita, Meunier, Frédéric, Dodin, Mathias, Martinez Franco, Raquel, Farrusseng, David, and Tuel, Alain
- Subjects
ZEOLITE catalysts ,PLATINUM catalyst synthesis ,PLATINUM nanoparticles ,HYDROGENATION ,ENCAPSULATION (Catalysis) ,CRYSTAL morphology ,TETRAALKYLAMMONIUM - Abstract
The aim of the present work is to synthesize a zeolite‐based catalyst with a hollow morphology and highly dispersed metal nanoparticles (NPs) encapsulated inside the zeolite micropores. For this purpose, we have studied a treatment using tetraalkylammonium (TAA) bromides for the selective removal of a large Pt particle from the outer surface of a hollow Beta zeolite. TEM analysis reveals that we succeeded in the synthesis of a hollow beta zeolite single crystal with encapsulated particles, with a high dispersion of 50–60 %. The molecular‐sieve‐type mechanism of the obtained catalysts was evaluated in the model reaction of toluene and mesitylene catalytic hydrogenation. Thanks to the high dispersion. a 10‐fold activity enhancement has been obtained with respect to hollow beta zeolites with encapsulated NPs recently described in the literature. The design of an "ideal" Pt‐supported zeolite catalyst is presented with the following features: 1) a high metal loading without NPs at the outer surface, 2) a high metal dispersion and 3) a short critical length (wall thickness <150–200 nm). Thanks to the high dispersion, a 10‐fold activity enhancement has been obtained with respect to hollow Beta zeolites with encapsulated NPs recently described in the literature. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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