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Asselman K, Pellens N, Thijs B, Doppelhammer N, Haouas M, Taulelle F, Martens JA, Breynaert E, Kirschhock CE. Ion-Pairs in Aluminosilicate-Alkali Synthesis Liquids Determine the Aluminum Content and Topology of Crystallizing Zeolites. Chem Mater 2022; 34:7150-7158. [PMID: 36032556 PMCID: PMC9404546 DOI: 10.1021/acs.chemmater.2c00773] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Using hydrated silicate ionic liquids, phase selection and framework silicon-to-aluminum ratio during inorganic zeolite synthesis were studied as a function of batch composition. Consisting of homogeneous single phasic liquids, this synthesis concept allows careful control of crystallization parameters and evaluation of yield and sample homogeneity. Ternary phase diagrams were constructed for syntheses at 90 °C for 1 week. The results reveal a cation-dependent continuous relation between batch stoichiometry and framework aluminum content, valid across the phase boundaries of all different zeolites formed in the system. The framework aluminum content directly correlates to the type of alkali cation and gradually changes with batch alkalinity and dilution. This suggests that the observed zeolites form through a solution-mediated mechanism involving the concerted assembly of soluble cation-oligomer ion pairs. Phase selection is a consequence of the stability for a particular framework at the given aluminum content and alkali type.
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Affiliation(s)
- Karel Asselman
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
| | - Nick Pellens
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
| | - Barbara Thijs
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
| | - Nikolaus Doppelhammer
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
- Institute
for Microelectronics and Microsystems, JKU
Linz, Linz 4040, Austria
| | - Mohamed Haouas
- Institut
Lavoisier de Versailles, Université
de Versailles Saint-Quentin-en-Yvelines, Versailles Cedex 78035, France
| | - Francis Taulelle
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
- NMR/X-ray
Platform for Convergence Research (NMRCoRe), KU Leuven, Leuven 3001, Belgium
| | - Johan A. Martens
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
- NMR/X-ray
Platform for Convergence Research (NMRCoRe), KU Leuven, Leuven 3001, Belgium
| | - Eric Breynaert
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
- NMR/X-ray
Platform for Convergence Research (NMRCoRe), KU Leuven, Leuven 3001, Belgium
| | - Christine E.A. Kirschhock
- Center
for Surface Chemistry and Catalysis—Characterisation and Application
Team (COK-KAT), KU Leuven, Leuven 3001, Belgium
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