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Issue 59, 2018, Issue in Progress
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Three-dimensional imaging and analysis of the internal structure of SAPO-34 zeolite crystals

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Abstract

SAPO-34 is widely used as a catalyst for important industrial reactions, such as the methanol-to-olefin (MTO) reaction and selective catalytic reduction (SCR) of nitrogen oxides (NOx). The internal structure of SAPO-34 has a great influence on the catalytic performance. Two-dimensional (2D) images of the SAPO-34 particle surfaces from scanning electron microscopy (SEM) show clearly well-faceted cube morphologies, which suggest they should be quite uniform perfect crystals. However, Bragg coherent X-ray diffraction imaging (BCDI) of the SAPO-34 particles shows a rich internal structure existing within these crystals. In this work, we investigated the internal structure of a SAPO-34 zeolite by serial block-face scanning electron microscopy (SBFSEM). The internal structure observed in the backscattered electron (BSE) micrographs from SBFSEM and the energy dispersive spectroscopy (EDS) measurements is found to be consistent with the BCDI results. From the three-dimensional (3D) structural images of SAPO-34 crystals obtained by SBFSEM, the domains within the individual SAPO-34 were visualized and quantified.

Graphical abstract: Three-dimensional imaging and analysis of the internal structure of SAPO-34 zeolite crystals

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Supplementary files

Article information


Submitted
11 Jul 2018
Accepted
22 Sep 2018
First published
01 Oct 2018

This article is Open Access

RSC Adv., 2018,8, 33631-33636
Article type
Paper

Three-dimensional imaging and analysis of the internal structure of SAPO-34 zeolite crystals

X. Bai, B. Chen, F. Yang, X. Liu, D. Silva-Nunes and I. Robinson, RSC Adv., 2018, 8, 33631
DOI: 10.1039/C8RA05918G

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