双四环型硅酸铝分子作为沸石合成单源前驱体的实验验证

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Akira Imaizumi, Yurika Ohnishi, Akinobu Nakada, Akinori Honda, Takeshi Matsumoto, Kenji Katayama, Ho-Chol Chang
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引用次数: 0

摘要

虽然利用传统离散铝源和硅源的水热法合成了多种功能沸石,但要控制目标沸石的组成、结构和功能,往往需要采用成本高、耗时长的试错法。尽管人们一直在努力通过调整铝和硅源及反应条件来操纵沸石的形成,但对使用具有预组织铝-氧-硅键的分子前驱体(MPs)合成沸石的研究却关注有限。在此,我们展示了使用具有双四环(D4R)型核心结构的[TMA]4[Al4Si4O12(OH)8]-13H2O([MP];TMA = 四甲基铵阳离子)作为 MP 合成 LTA 型沸石的过程,双四环(D4R)型核心结构是 LTA 型沸石中已知的二级构建单元(SBU)。在此,我们展示了在 100-200 °C 水热条件下,在 1 个等量的 NaOH 或 NaCl 存在下,利用 [MP] 成功合成 LTA 型沸石的过程。值得注意的是,在其他条件相同(相同的硅/铝比例、Na+含量和温度)的情况下,当使用离散的铝和硅源代替[MP]时,除了获得LTA型沸石外,还获得了缺乏D4R结构的GIS型、SOD型和FAU型沸石。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental verification of double-four-ring-type aluminosilicate molecule as a single-source precursor for zeolite synthesis
While a variety of functional zeolites have been synthesized using hydrothermal methods with conventional discrete Al and Si sources, control of the composition, structure, and function of the targeted zeolites often involves costly and time-consuming trial-and-error approaches. Despite ongoing efforts to manipulate zeolite formation by adjusting Al and Si sources and reaction conditions, limited attention has been given to studies on zeolite synthesis using molecular precursors (MPs) with pre-organized Al–O–Si bonds. Here, we demonstrate the synthesis of LTA-type zeolites using [TMA]4[Al4Si4O12(OH)8]·13H2O ([MP]; TMA = tetramethylammonium cation) with a double-four-ring (D4R)-type core structure, which is known to be a secondary building unit (SBU) in the LTA-type zeolite, as a MP. Here, we demonstrate the successful synthesis of LTA-type zeolites using [MP] under hydrothermal conditions at 100–200 °C in the presence of 1 equivalent of NaOH or NaCl. Notably, when discrete Al and Si sources were used instead of [MP] under otherwise identical conditions (the same Si/Al ratio, Na+ content, and temperature), GIS-, SOD-, and FAU-type zeolites lacking the D4R structure were obtained in addition to the LTA-type zeolites.
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
期刊介绍: ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/​Abstracted: Web of Science SCIE Scopus CAS INSPEC Portico
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