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Transformation Control of a Layered Zeolite Precursor by Simple Cation Exchange
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-11 , DOI: 10.1021/acs.chemmater.0c03562 Sang Hyun Ahn 1 , Suk Bong Hong 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-11 , DOI: 10.1021/acs.chemmater.0c03562 Sang Hyun Ahn 1 , Suk Bong Hong 1
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The topotactic transformation of layered zeolite precursors to three-dimensional zeolite frameworks is of major importance because it is a viable option for finding new zeolite structures. Here, we report the synthesis of a new CDO zeolite precursor with a Si/Al ratio of 6.5, named PST-23, using 4-(dimethylamino)-1-methylpyridinium (DMAMP+) ions as an organic structure-directing agent in fluoride media. We also show that the ion exchange of the as-synthesized DMAMP-PST-23 with inorganic and organic cations smaller than DMAMP+ followed by calcination at 600 °C leads to the transformation into FER and CDO zeolites, respectively. The overall characterization results demonstrate that cation exchange in the as-synthesized PST-23 leads to significant changes in the local environment of framework tetrahedral sites, as well as a notable decrease in the interlayer distance, which allows its topotactic transformation to occur in different ways, without the initial swelling step. We have also generated three novel hypothetical zeolite structures built from fer, heu, and cas layers, which are chemically feasible and thus synthesizable.
中文翻译：
简单阳离子交换对层状沸石前体的转变控制
层状沸石前体向三维沸石骨架的向位转变非常重要，因为它是寻找新沸石结构的可行选择。在这里，我们报告了使用4-（二甲基氨基）-1-甲基吡啶鎓（DMAMP +）离子作为氟化物中的有机结构导向剂，合成了一种新的具有Si / Al比6.5的CDO沸石前体，称为PST-23。媒体。我们还表明，所合成的DMAMP-PST-23与小于DMAMP +的无机和有机阳离子的离子交换然后在600°C下煅烧分别转化为FER和CDO沸石。总体表征结果表明，合成后的PST-23中的阳离子交换会导致框架四面体位点的局部环境发生重大变化，并且层间距离显着减小，这使其阳离子变换以不同方式发生，无需进行初始溶胀步骤。我们还从fer，heu和cas层构建了三种新颖的假想沸石结构，这些结构在化学上是可行的，因此可以合成。
更新日期：2020-11-25
中文翻译：
简单阳离子交换对层状沸石前体的转变控制
层状沸石前体向三维沸石骨架的向位转变非常重要，因为它是寻找新沸石结构的可行选择。在这里，我们报告了使用4-（二甲基氨基）-1-甲基吡啶鎓（DMAMP +）离子作为氟化物中的有机结构导向剂，合成了一种新的具有Si / Al比6.5的CDO沸石前体，称为PST-23。媒体。我们还表明，所合成的DMAMP-PST-23与小于DMAMP +的无机和有机阳离子的离子交换然后在600°C下煅烧分别转化为FER和CDO沸石。总体表征结果表明，合成后的PST-23中的阳离子交换会导致框架四面体位点的局部环境发生重大变化，并且层间距离显着减小，这使其阳离子变换以不同方式发生，无需进行初始溶胀步骤。我们还从fer，heu和cas层构建了三种新颖的假想沸石结构，这些结构在化学上是可行的，因此可以合成。
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