Atomic-scale detection of individual lead clusters confined in Linde Type A zeolites,Nanoscale

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Atomic-scale detection of individual lead clusters confined in Linde Type A zeolites
Nanoscale ( IF 5.8 ) Pub Date : 2022-06-06 , DOI: 10.1039/d2nr01819e
Jarmo Fatermans _{1,

2} , Giacomo Romolini ₃ , Thomas Altantzis _{1,

2,

4} , Johan Hofkens _{3,

5} , Maarten B J Roeffaers ₆ , Sara Bals _{1,

2} , Sandra Van Aert _{1,

2}

Affiliation

Structural analysis of metal clusters confined in nanoporous materials is typically performed by X-ray-driven techniques. Although X-ray analysis has proved its strength in the characterization of metal clusters, it provides averaged structural information. Therefore, we here present an alternative workflow for bringing the characterization of confined metal clusters towards the local scale. This workflow is based on the combination of aberration-corrected transmission electron microscopy (TEM), TEM image simulations, and powder X-ray diffraction (XRD) with advanced statistical techniques. In this manner, we were able to characterize the clustering of Pb atoms in Linde Type A (LTA) zeolites with Pb loadings as low as 5 wt%. Moreover, individual Pb clusters could be directly detected. The proposed methodology thus enables a local-scale characterization of confined metal clusters in zeolites. This is important for further elucidation of the connection between the structure and the physicochemical properties of such systems.

中文翻译：

限制在林德 A 型沸石中的单个铅簇的原子级检测

限制在纳米多孔材料中的金属簇的结构分析通常通过 X 射线驱动技术进行。尽管 X 射线分析已证明其在金属团簇表征方面的优势，但它提供的是平均结构信息。因此，我们在这里提出了一种替代工作流程，用于将受限金属团簇的表征带入局部尺度。该工作流程基于像差校正透射电子显微镜 (TEM)、TEM 图像模拟和粉末 X 射线衍射 (XRD) 与先进统计技术的结合。以这种方式，我们能够表征林德 A 型 (LTA) 沸石中铅原子的聚集，铅含量低至 5 wt%。此外，可以直接检测到单个 Pb 簇。因此，所提出的方法能够对沸石中的受限金属团簇进行局部尺度表征。这对于进一步阐明此类系统的结构和物理化学性质之间的联系很重要。

更新日期：2022-06-10

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