“Correlative laboratory Nano-CT and 360° electron tomography of macropore structures in hierarchical zeolites” published in Advanced Materials Interfaces

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The article “Correlative laboratory Nano-CT and 360° electron tomography of macropore structures in hierarchical zeolites” by CRC-researchers Benjamin Apeleo Zubiri, Janis Wirth, Dominik Drobek, Silvan Englisch and Erdmann Spiecker as well as Thomas Przybilla, Tobias Weissenberger and Wilhelm Schwieger has recently been published in Advanced Materials Interfaces. The article is part of the special issue on Hierarchically-Ordered Materials.

Hierarchical pore structures exhibit morphological features on several length scales, which govern important materials properties in catalysis, such as catalytic activity, diffusivity or selectivity. Correlative tomography offers unique opportunities for a comprehensive and scale-bridging 3D characterization of such complex pore morphologies, which is crucial to further optimize materials design and synthesis routines. This study explores the capabilities of correlative 360° electron tomography (ET) and lab-based nano X-ray computed tomography (Nano-CT) enabling 3D analyses of volumes of up to (60 µm)³ with down to nm resolution, as demonstrated for zeolite particles with embedded macropores. By first applying the two techniques to the same particle the higher resolution and fidelity of ET are used to improve the segmentation of pore space in the Nano-CT reconstruction. Extended statistical relevance and access to interparticle pore space are obtained from reconstructions of larger particle agglomerates, using the large-field-of-view mode of the Nano-CT. The presented correlative approach enables real space analyses of important pore characteristics for comparison with complementary pore characterization techniques. Moreover, by investigating samples from different stages of the synthesis, 360°-ET and Nano-CT provide unique insights into the formation mechanism of porous materials, as demonstrated for the steam-assisted crystallization of the macroporous zeolite particles.