Direct Imaging and Location of Pb2+ and K+ in EMT Framework-Type Zeolite
| Autor: | Jennifer Elizabeth Readman, Daniel Smith, Yaping Zhang, Alvaro Mayoral |
|---|---|
| Přispěvatelé: | National Centre for High Resolution Electron Microscopy (The Netherlands), ShanghaiTech University, National Natural Science Foundation of China, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Gobierno de Aragón, Diputación General de Aragón, European Commission |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Direct imaging Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Structural framework Article 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Physical and Theoretical Chemistry 0210 nano-technology Zeolite F170 |
| Zdroj: | Zaguán. Repositorio Digital de la Universidad de Zaragoza instname Digital.CSIC. Repositorio Institucional del CSIC The Journal of Physical Chemistry. C, Nanomaterials and Interfaces |
| ISSN: | 1932-7447 |
| Popis: | The understanding of the structural framework and metal locations within zeolites are two critical aspects to tune and further exploit their properties as heterogeneous catalysts, advanced optical devices, or as water remediation materials. The development of electron microscopy has made it possible to observe directly the zeolitic framework and the distribution of extra framework cations within the pores at the atomic level. Here, we have studied the EMT framework providing data with an unprecedented spatial resolution, which have allowed the analysis of the FAU domains present in the framework. Additionally, potassium and lead (introduced by aqueous ion exchange), which were nonperiodically distributed in the pores have been located. An alternative image mode, annular bright field, has been used, proving its usefulness to extend the spatial resolution and increase the sensitivity toward light elements such as bridging oxygen. Finally, the combination of atomic imaging (local information) with the three-dimensional electron diffraction tomography analysis (averaged information) determined the lead-EMT crystal symmetry to be P63mc. The authors would like to thank the Centre for High-resolution Electron Microscopy (CℏEM), supported by SPST of ShanghaiTech University under contract No. EM02161943 and the National Natural Science Foundation of China NFSC-21850410448 and NSFC- 21835002. A.M. also acknowledges the Spanish Ministry of Science through the Ramon y Cajal Program (RYC2018-024561-I) and the regional government of Aragon (Spain) (DGA E13_20R). This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement no. 823717—ESTEEM3. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|