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

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 AlPO 4 -5 with AFI topology could successfully produce an unknown highly crystalline phase, n...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2024-06, Vol.53 (22), p.936-9314
Main Authors: Komura, Kenichi, Nakai, Gensuke, Shimizu, Soki, Nomura, Matsuri, Niwa, Shiori, Kagari, Sanae, Oka, Kazuma, Imai, Edo, Aoki, Hisakazu, Ikeda, Takuji
Format: Article
Language:English
Subjects:
Aluminum phosphate
Corrugated sheet
Hydrogen bonds
Hydrothermal crystal growth
Metallography
Silicon dioxide
Single crystals
Topology
Zeolites
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Summary: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 AlPO 4 -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 SiO 2 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 AlPO 4 -5 into GAM-7 and have argued a reasonable consideration for the IZC process. 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).
ISSN:1477-9226
1477-9234
DOI:10.1039/d4dt00751d