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.

中文翻译：

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GAM-7：通过沸石转化形成的有机-无机杂化层状磷酸铝晶体


使用非环状仲胺二异丙胺作为有机结构导向剂（OSDA）证明了金属磷酸盐和铝磷酸盐沸石的沸石间转化（IZC）。具有 AFI 拓扑的 AlPO ₄ -5 的 IZC 可以成功地产生一种未知的高度结晶相，命名为 GAM-7。在金属铝磷酸盐（金属-AlPO）中，SAPO-5与少量SiO ₂ 也相互转化为单晶GAM-7，命名为[Si]GAM-7。然而，在其他金属-AlPO中，相应的GAM-7晶体形成为中间体或多个晶体的混合物。此外，还发现GAM-7也可以通过水热合成（HTS）获得，但不能由硅铝磷酸盐水凝胶合成，表明[Si]GAM-7只能通过IZC技术制备。所获得的GAM-7晶体得到了很好的表征，以阐明框架结构，这表明GAM-7是一种新型有机-无机杂化层状磷酸铝，在波纹层状片材中具有末端POH基团，并且层之间具有OSDA分子通过氢键与酸性 POH 位点发生强有力的相互作用。此外，我们还对 AlPO ₄ -5 转化为 GAM-7 过程中的 pH 值进行了跟踪，并对 IZC 过程提出了合理的考虑。