Marques Mota, F., Eliášová, P., Jung, J. and Ryoo, R. (2016) Impact of pore topology and crystal thickness of nanosponge zeolites on the hydroconversion of ethylbenzene. Catalysis Science & Technology, 6 (8). pp. 2653-2662. ISSN 2044-4753
Full content URL: https://doi.org/10.1039/c5cy02029h
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(2016) Catal. Sci. Technol. 6, 2653.pdf - Whole Document Restricted to Repository staff only 3MB |
Item Type: | Article |
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Item Status: | Live Archive |
Abstract
The gas-phase hydroconversion of ethylbenzene was investigated in the presence of intimate mixtures of *MRE, MFI and MTW-type zeolite nanosponges and a hydrogenating component (Pt/Al2O3). The nano-morphic zeolites were prepared using multiammonium surfactants acting as dual-porogenic agents directing the formation of micro- and mesopores simultaneously. The effects of the zeolite topology (pore size and dimensionality) and crystal thickness on the product selectivity of ultra-thin zeolite frameworks (<10 nm) were investigated. The enhanced catalytic activity confirmed the importance of improved molecular diffusion. These nanosponges were unique in producing more xylenes, suggesting lower confinement effects. The selectivity for p-xylene and the selectivity towards ethylbenzene hydroisomerization, dealkylation, disproportionation, transalkylation and hydrocracking were evaluated. Despite the similar <10 nm crystal thickness of all the nanosponge zeolites, the presence of spacious channel interconnections in MFI was concluded to remarkably impact the product selectivity compared to straight channels as in *MRE and MTW. Our findings clarify the relatively unexplored transformation of alkyl-aromatics over ultra-thin zeolite crystals, through five typical catalytic reactions of major industrial interest.
Keywords: | zeolites, MFI, microporosity, mesoporosity, nanosponges |
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Subjects: | F Physical Sciences > F200 Materials Science F Physical Sciences > F110 Applied Chemistry H Engineering > H800 Chemical, Process and Energy Engineering H Engineering > H810 Chemical Engineering |
Divisions: | College of Science > School of Chemistry |
ID Code: | 53659 |
Deposited On: | 07 Mar 2023 12:58 |
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