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Article

Lights and Shadows of Gold Introduction into Beta Zeolite

Faculty of Chemistry, Adam Mickiewicz University, Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
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Academic Editors: Jerzy Datka, Włodzimierz Mozgawa and Dorota Rutkowska-Zbik
Molecules 2020, 25(24), 5781; https://doi.org/10.3390/molecules25245781
Received: 12 November 2020 / Revised: 3 December 2020 / Accepted: 5 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Zeolites and Mesoporous Materials: Properties and Applications)
Four different methods for gold deposition on Beta zeolite, namely impregnation, ion-exchange, deposition-reduction, and grafting on (3-aminopropyl)trimethoxysilane functionalized support, were applied to investigate their influence on textural/structural changes in the zeolite support and its surface acidity. The as-prepared materials were fully characterized by XRD, N2 physisorption, ICP-OES, XPS, TEM, and pyridine adsorption. The obtained results indicated that bifunctional redox–acidic materials prepared within this work were characterized not only by different gold loading and gold particle size, but also different textural parameters and acidity. All these features were strongly affected by the procedure applied for gold deposition. The introduction of Au into Beta zeolite by ion exchange caused a significant decrease in the Si/Al ratio in the zeolite framework. The size of Au particles determined the textural parameters of the zeolite and the number of Lewis acid sites (LAS). The Brønsted acid sites (BAS) number was decreased if (3-aminopropyl)trimethoxysilane or NaBH4 were used in the procedure of gold deposition. The highest BAS/LAS ratio was achieved for the sample prepared by ion exchange in the ammonium form of Beta zeolite. The presented results permit making a proper choice of the gold modification procedure for the preparation of bifunctional (redox–acidic) materials, addressed to a desired application. View Full-Text
Keywords: gold nanoparticles; wet impregnation; ion exchange; deposition-reduction; grafting with organosilane; efficiency of gold loading; zeolite acidity; zeolite porosity; zeolite desilication gold nanoparticles; wet impregnation; ion exchange; deposition-reduction; grafting with organosilane; efficiency of gold loading; zeolite acidity; zeolite porosity; zeolite desilication
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MDPI and ACS Style

Walkowiak, A.; Wolski, L.; Ziolek, M. Lights and Shadows of Gold Introduction into Beta Zeolite. Molecules 2020, 25, 5781. https://doi.org/10.3390/molecules25245781

AMA Style

Walkowiak A, Wolski L, Ziolek M. Lights and Shadows of Gold Introduction into Beta Zeolite. Molecules. 2020; 25(24):5781. https://doi.org/10.3390/molecules25245781

Chicago/Turabian Style

Walkowiak, Adrian, Lukasz Wolski, and Maria Ziolek. 2020. "Lights and Shadows of Gold Introduction into Beta Zeolite" Molecules 25, no. 24: 5781. https://doi.org/10.3390/molecules25245781

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