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Atomic resolution analysis of porous solids: A detailed study of silver ion-exchanged zeolite A

DOI: 10.1016/j.micromeso.2012.04.033 DOI Help

Authors: Alvaro Mayoral (Universidad de Zaragoza, Spain) , Thomas Carey (University of Birmingham, U.K.) , Paul A. Anderson (University of Birmingham, U.K.) , Isabel Diaz (Instituto de Catálisis y Petroleoquímica, CSIC, Madrid, Spain)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Microporous And Mesoporous Materials

State: Published (Approved)
Published: April 2012

Abstract: Currently, aberration corrected scanning transmission electron microscopy is a powerful technique to observe with the maximum resolution of all kinds of materials. Unfortunately, this advanced technique has failed in its application to poroussolids such as zeolites, which are extremely beam sensitive inorganic solids. By controlling the beam current we have successfully managed to image the most beam sensitive zeolite, zeoliteA (LTA type, Si/Al = 1) and observe the distribution of silver within the cages, observing for the first time silver octahedra composed of six atoms. These results open up the possibility of applying this technique to any zeolitic framework with the potential capability of even observing the oxygen distribution. Some preliminary results using an annular bright field (ABF) in combination with the HAADF detectors on ZSM-5 (MFI type) zeolite are also presented in this manuscript demonstrating the possibility of obtaining real atomicresolution images of the zeolitic framework.

Journal Keywords: Aberration Corrected Electron Microscopy; Zeolites; Powder X-Ray Diffraction

Subject Areas: Materials

Instruments: I11-High Resolution Powder Diffraction

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