期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 29, 页码 7158-7167出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201805664
关键词
aluminum zoning; Raman spectroscopy; steaming; zeolite
资金
- European Research Council (ERC) Advanced Grant [321140]
- European Research Council (ERC) [321140] Funding Source: European Research Council (ERC)
Hydrothermal treatment is a common method used to modify the physicochemical properties of zeolite-based catalyst materials. It alters the number and type of acid sites through dealumination and increases molecular diffusion by mesopore formation. Steaming also reduces the structural integrity of zeolite frameworks. In this study, Raman microscopy has been used to map large zeolite ZSM-5 crystals before and after steaming. 3D elemental maps of T-O (T: Al or Si) sites of the zeolite were obtained. The Raman active vibrational bands were determined, which are indicative of (non-) framework Al, as well as of structural integrity. Zeolite steaming caused the introduction of additional heterogeneities within the zeolite framework. Al migration and the formation of extra-framework Al species were observed. The described experiments demonstrate the capability of 3D Raman spectroscopy as a valuable tool to obtain information on the spatial distributions of framework elements as well as defects within a zeolite-based material.
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