Impact of pore topology and crystal thickness of nanosponge zeolites on the hydroconversion of ethylbenzene

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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Impact of pore topology and crystal thickness of nanosponge zeolites on the hydroconversion of ethylbenzene
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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
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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