Finned zeolite catalysts

There is growing evidence for the advantages of synthesizing nanosized zeolites with markedly reduced internal diffusion limitations for enhanced performances in catalysis and adsorption. Producing zeolite crystals with sizes less than 100 nm, however, is non-trivial, often requires the use of compl...

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Vydáno v:	Nature materials Ročník 19; číslo 10; s. 1074 - 1080
Hlavní autoři:	Dai, Heng, Shen, Yufeng, Yang, Taimin, Lee, Choongsze, Fu, Donglong, Agarwal, Ankur, Le, Thuy Thanh, Tsapatsis, Michael, Palmer, Jeremy C., Weckhuysen, Bert M., Dauenhauer, Paul J., Zou, Xiaodong, Rimer, Jeffrey D.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	London Nature Publishing Group UK 01.10.2020 Nature Publishing Group Springer Nature - Nature Publishing Group
Témata:	119/118 140/131 140/146 639/301/299/1013 639/638/77/884 Aluminosilicates Aluminum silicates Biomaterials Catalysis Chemical synthesis Chemistry Chemistry and Materials Science Condensed Matter Physics Crystallography Crystals Epitaxial growth Fins Mass transport Materials Science Nanocrystals Nanoparticles Nanotechnology Optical and Electronic Materials Physics Titration Transport properties Zeolites
ISSN:	1476-1122, 1476-4660, 1476-4660
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Popis
Shrnutí:	There is growing evidence for the advantages of synthesizing nanosized zeolites with markedly reduced internal diffusion limitations for enhanced performances in catalysis and adsorption. Producing zeolite crystals with sizes less than 100 nm, however, is non-trivial, often requires the use of complex organics and typically results in a small product yield. Here we present an alternative, facile approach to enhance the mass-transport properties of zeolites by the epitaxial growth of fin-like protrusions on seed crystals. We validate this generalizable methodology on two common zeolites and confirm that fins are in crystallographic registry with the underlying seeds, and that secondary growth does not impede access to the micropores. Molecular modelling and time-resolved titration experiments of finned zeolites probe internal diffusion and reveal substantial improvements in mass transport, consistent with catalytic tests of a model reaction, which show that these structures behave as pseudo-nanocrystals with sizes commensurate to that of the fin. This approach could be extended to the rational synthesis of other zeolite and aluminosilicate materials. Nanosized zeolites enable better catalytic performance; however, their synthesis is non-trivial. Here, a simple treatment is presented that enables the growth of nanosized fins on zeolites that act as pseudo-nanoparticles, reducing deactivation rates for methanol-to-hydrocarbon catalysis.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 SC0001004; SC0014468 USDOE Office of Science (SC)
ISSN:	1476-1122 1476-4660 1476-4660
DOI:	10.1038/s41563-020-0753-1