1. Design of MFI Zeolite-Based Composites with Hierarchical Pore Structure: A New Generation of Structured Catalysts.
- Author
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F. Ocampo, H.S. Yun, M. Maciel Pereira, J. P. Tessonnier, and B. Louis
- Subjects
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COMPOSITE materials , *ZEOLITES , *CHEMICAL structure , *CATALYSTS , *PARTICLE size distribution , *CRYSTAL growth , *RECRYSTALLIZATION (Metallurgy) , *MOLECULAR self-assembly - Abstract
Zeolite/glass composite materials with hierarchical trimodal pore size distributions have been successfully prepared and subsequently characterized. Starting from glass monoliths having meso- and macropores, additional microporosity was introduced while allowing the growth of zeolite crystals via partial recrystallization of the glass support into ZSM-5 zeolite phase. Structured zeolitic catalytic materials were produced using a combination of supramolecular templating methods to produce the glass support, followed by conventional self-assembly of template cations and silica species. Zeolite crystals are therefore in intimate contact with the glass support, featuring micropores in addition to the mesopores. Hence, these zeolite/glass composites exhibit enhanced diffusional properties in comparison with purely microporous zeolite materials. These enhanced mass transport properties allowed improvement of the selectivity toward light olefins in the important n-hexane cracking reaction. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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