4.6 Article

Structure-Directing Roles of Organic Molecules in the Formation of Aluminosilicate and Aluminophosphate Molecular Sieves Revealed by 2D 1H DQ-SQ NMR Spectroscopy

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume 27, Issue 6, Pages 1955-1960

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202003892

Keywords

H-1 double quantum NMR; molecular sieves; NMP spectroscopy; organic structure directing agents; zeolites

Funding

  1. National Natural Foundation of China [21673282]

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The understanding of crystallization mechanisms of molecular sieves is driven by their broad range of usefulness and unique properties. The electrostatic interactions between organic structure-directing agents (OSDAs) and the framework, as well as the correlation among OSDAs, play dominant roles in the crystallization process. This fundamental understanding could be valuable for designing and synthesizing new molecular sieves with desirable structural properties.
Understanding of crystallization mechanisms of molecular sieves is driven by the broad range of usefulness and unique properties they possess. It is still difficult to obtain information related to the crystallization mechanism of molecular sieves, partly because the materials are generally prepared under hydrothermal conditions and the whole reaction happens in the black box autoclave. In this work, 2D H-1 DQ-SQ NMR results clearly demonstrate that it is not only the electrostatic interactions between organic structure-directing agents (OSDAs) and the framework, but also the correlation among OSDAs playing the dominant structural directing roles during the crystallization process. Our fundamental understanding of the crystallization mechanism of molecular sieves could be of great value to design and synthesize new molecular sieves with desirable structural properties.

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