Jin Zhang, Qiudi Yue, Emad Shamma, Sara Abdi, Oleg Petrov, Jiri Cejka, Svetlana Mintova, Maksym Opanasenko, Mariya Shamzhy
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引用次数: 0
摘要
锗硅酸盐沸石结构多样,质地多变,是一种极具吸引力的吸附剂和催化剂。然而,即使在环境条件下,这类沸石的水解不稳定性也限制了它们的实际应用。在本研究中,我们报告了在水介质中由于 Ge 脱插和 Si 重新插入而导致的沸石框架原子状态的动态变化,并提出了通过管理这两个过程来稳定富含 Ge 的平面和正交态沸石的策略。通过调节水环境的酸度或温度,可以使 Ge 原子和 Si 原子达到平衡的迁移率,从而使 Ge 原子被浸出,Si 原子被插入被释放的位置,从而稳定沸石框架。所开发的方法为任何易溶锗硅酸盐材料的结构稳定提供了一种实用、可控的方法,正如加入铝相关酸中心后所证明的那样,这种方法在催化方面具有潜在的应用价值。
Balancing Ge de-intercalation and Si re-insertion rates stabilizes hydrolytically labile germanosilicate zeolites
Germanosilicate zeolites are attractive adsorbents and catalysts thanks to their diverse structures and versatile textural properties. However, hydrolytic instability of such zeolites, even under ambient conditions, restricts their practical applications. In this study, we report on dynamic changes in the state of the zeolite framework atoms due to Ge de-intercalation and Si re-insertion in aqueous medium and propose the strategy for stabilizing zeolites with planar and orthogonal location of Ge-rich domains by managing both processes. Adjusting the acidity or temperature of the aqueous environment enabled Ge and Si atoms to reach balanced mobility allowing Ge atoms to be leached and Si atoms to be inserted into the released positions, thereby stabilizing the zeolite framework. The developed approach offers a practical and controllable method for structural stabilization of any labile germanosilicate material, with potential applications in catalysis, as demonstrated after incorporation of Al-associated acid centers.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.