Issue 22, 2024

GAM-7: an organic–inorganic hybrid layered aluminophosphate crystal formed by zeolite transformation

Abstract

The interzeolite conversion (IZC) of metallo- and aluminophosphate zeolites was demonstrated using a non-cyclic secondary amine, diisopropylamine, as the organic structure-directing agent (OSDA). The IZC of AlPO4-5 with AFI topology could successfully produce an unknown highly crystalline phase, named GAM-7. In metallo-aluminophosphates (metal-AlPOs), SAPO-5 with a small amount of SiO2 was also interconverted to a single crystal GAM-7, designated as [Si]GAM-7. However, in other metal-AlPOs, the corresponding GAM-7 crystals were formed as either an intermediate or a mixture of plural crystals. Additionally, it was found that GAM-7 could also be obtained by hydrothermal synthesis (HTS), but not synthesized from a silico-aluminophosphate hydrogel, indicating that [Si]GAM-7 can be prepared by only the IZC technique. The obtained GAM-7 crystal was well-characterized to elucidate the framework structure, and this revealed that GAM-7 was a new organic–inorganic hybrid layered aluminophosphate having a terminal POH group in the corrugated layered sheets, and the OSDA molecule between the layers was robustly interacting with an acidic POH site by a hydrogen bond. Furthermore, we have performed the tracking of pH values during the transformation from AlPO4-5 into GAM-7 and have argued a reasonable consideration for the IZC process.

Graphical abstract: GAM-7: an organic–inorganic hybrid layered aluminophosphate crystal formed by zeolite transformation

Supplementary files

Article information

Article type
Paper
Submitted
13 Mar 2024
Accepted
30 Apr 2024
First published
01 May 2024

Dalton Trans., 2024,53, 9306-9314

GAM-7: an organic–inorganic hybrid layered aluminophosphate crystal formed by zeolite transformation

K. Komura, G. Nakai, S. Shimizu, M. Nomura, S. Niwa, S. Kagari, K. Oka, E. Imai, H. Aoki and T. Ikeda, Dalton Trans., 2024, 53, 9306 DOI: 10.1039/D4DT00751D

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