A Cooperative OSDA Blueprint for Highly Siliceous Faujasite Zeolite Catalysts with Enhanced Acidity Accessibility
| Autor: | Michiel Dusselier, Ibrahim Khalil, Rodrigo de Oliveira-Silva, Bert F. Sels, Dimitrios Sakellariou, Zheng Li, Quanli Ke, Brent Smeyers |
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| Rok vydání: | 2021 |
| Předmět: |
cooperative OSDA
siliceous materials SMALL-PORE ZEOLITES Chemistry Multidisciplinary Nucleation engineering.material Heterogeneous catalysis Medicinal chemistry Catalysis chemistry.chemical_compound Acid catalysis Zeolite Conformational isomerism FAU zeolite Science & Technology Chemistry General Medicine General Chemistry ALUMINUM DEGRADATION PERFORMANCE Faujasite pyrolysis FRAMEWORK acid site distribution CONVERSION FAU Physical Sciences Sodalite engineering CHOLINE CRYSTALLIZATION |
| Zdroj: | Angewandte Chemie International Edition. 60:24189-24197 |
| ISSN: | 1521-3773 1433-7851 |
| DOI: | 10.1002/anie.202109163 |
| Popis: | A cooperative OSDA strategy is demonstrated, leading to novel high-silica FAU zeolites with a large potential for disruptive acid catalysis. In bottom-up synthesis, the symbiosis of choline ion (Ch+ ) and 15-crown-5 (CE) was evidenced, in a form of full occupation of the sodalite (sod) cages with the trans Ch+ conformer, induced by the CE presence. CE itself occupied the supercages along with additional gauche Ch+ , but in synthesis without CE, no trans was found. The cooperation, and thus the fraction of trans Ch+ , was closely related to the Si/Al ratio, a key measure for FAU stability and acidity. As such, a bottom-up handle for lowering the Al-content of FAU and tuning its acid site distribution is shown. A mechanistic study demonstrated that forming sod cages with trans Ch+ is key to the nucleation of high-silica FAU zeolites. The materials showed superior performances to commercial FAU zeolites and those synthesized without cooperation, in the catalytic degradation of polyethylene. ispartof: Angewandte Chemie-International Edition vol:60 issue:45 pages:24189-24197 ispartof: location:Germany status: published |
| Databáze: | OpenAIRE |
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