Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 9, Pages 3350-3356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c00551
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Funding
- National Natural Science Foundation of China [21850410448, 21835002, 21850316, 21971259, 21621001]
- 111 Project of China [B17020]
- SPST of ShanghaiTech University [EM02161943]
- Foreign 1000 Talents Plan, China
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Defects within zeolites are crucially important for explaining their physicochemical behavior. The UTL zeolite, with a pillared layer structure, has been widely used in zeolite crystal engineering to assemble new structures from its layered structural units, but a fundamental understanding of its defect is lacking. Here, we report a newly synthesized UTL framework zeolite, UTL-DBU, with a commercially available superbase 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as a template. Its structure was determined by a combination of three-dimensional electron diffraction tomography and high-resolution (scanning) transmission electron microscopy. Using transmission electron microscopy, two types of defects, stacking disorder and edge dislocation-like planar defect, were discovered. On the basis of the analysis of the electron diffraction and imaging, the layer stacking sequence together with the structural and mathematical models of the microtwinning was successfully built up. Unraveling these defects will provide new insights into the rational design of targeted zeolites utilizing UTL.
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