Genesis of Delaminated-Zeolite Morphology: 3-D Characterization of Changes by STEM Tomography
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- 作者：Ilke Arslan ; John D. Roehling ; Isao Ogino ; K. Joost Batenburg ; Stacey I. Zones ; Bruce C. Gates ; Alexander Katz
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2015
- 出版时间：July 2, 2015
- 年：2015
- 卷：6
- 期：13
- 页码：2598-2602
- 全文大小：290K
- ISSN：1948-7185
文摘
Zeolite delamination increases the external surface area available for catalyzing the conversion of bulky molecules, but a fundamental understanding of the delamination process remains unknown. Here we report morphological changes accompanying delamination on the length scale of individual zeolite clusters determined by 3-D imaging in scanning transmission electron microscopy. The results are tomograms that demonstrate delamination as it proceeds on the nanoscale through two distinct key steps: a chemical treatment that leads to a swelled material and a subsequent calcination that leads to curling and peeling off of delaminated zeolite sheets over hundreds of nanometers. These results characterize the direct, local, 3-D morphological changes accompanying delaminated materials synthesis and, with corroboration by mercury porosimetry, provide unique insight into the morphology of these materials, which is difficult to obtain with any other technique.