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Issue 7, 2018
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New insights into the di-n-propylamine (DPA) molecule as an organic structural directing agent (OSDA) in the crystallization of AlPO4-11 molecular sieve

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Abstract

Advanced solid-state NMR techniques, including PT-J-HMQC 27Al/31P double-resonance NMR, 2D 31P and 1H DQ-SQ MAS NMR experiments, have been used to study the structure-directing effect in the crystallization of the molecular sieve AlPO4-11 synthesized by a solvent-free method. Our studies clearly demonstrate the mechanism of crystallization of the molecular sieve AlPO4-11 for the first time as follows: (i) the organic template of di-n-propylamine (DPA) molecules can effectively induce transformation from the 4- and/or 6-MR chains to a 2D-layered structure through H-bond interactions; (ii) the formation of a twin molecule (two-DPA) drives the transformation from a 2D-layered structure to 3D crystals. Theoretical calculations further confirm that the formation of the twin DPA molecule is thermodynamically stable in the channels of AlPO4-11. Deep understanding of the role of OSDAs in crystallization is potentially important for the design and synthesis of aluminophosphate-based molecular sieves with novel structures and new routes.

Graphical abstract: New insights into the di-n-propylamine (DPA) molecule as an organic structural directing agent (OSDA) in the crystallization of AlPO4-11 molecular sieve

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Publication details

The article was received on 15 Apr 2018, accepted on 08 May 2018 and first published on 08 May 2018


Article type: Research Article
DOI: 10.1039/C8QI00346G
Citation: Inorg. Chem. Front., 2018,5, 1633-1639
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    New insights into the di-n-propylamine (DPA) molecule as an organic structural directing agent (OSDA) in the crystallization of AlPO4-11 molecular sieve

    N. Sheng, Y. Chu, S. Xin, Q. Wang, X. Liu, J. Xu, F. Xiao and F. Deng, Inorg. Chem. Front., 2018, 5, 1633
    DOI: 10.1039/C8QI00346G

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