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Controlling diffusion resistance, selectivity and deactivation of ZSM-5 catalysts by crystal thickness and defects
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
Luleå University of Technology, Sweden.
RISE Research Institutes of Sweden, Built Environment, Energy and Resources. Luleå University of Technology, Sweden.
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2022 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 410, p. 320-332Article in journal (Refereed) Published
Abstract [en]

A systematic investigation of two sets of defect free and defective ZSM-5 crystals with controlled thickness (T) between 30 and 400 nm and of their performances in methanol conversion was reported for the first time in the present work. The defect free ZSM-5 crystals with a thickness of 35 nm are by far the smallest ever reported and displayed superior activity, stability and selectivity to slower diffusing compounds, which resulted in high yield of e.g. gasoline and the 1,2,4-trimethylbenzene isomer with high octane number, as compared to the other studied catalysts. Almost only products forming in the zeolite pores were detected and consequently, the external surface must be nearly inactive. Strong correlations between T and deactivation rate were observed. Thick crystals deactivated much faster than thin crystals, probably due to formation of carbon species in the zeolite pores, which results in pronounced percolation effects and faster deactivation of the former. At comparable thickness, crystals with defects deactivated much faster than defect free crystals, due to formation of additional small molecular coke species in the former. Strong correlations between T and selectivity were also observed and assigned to control of diffusion resistance by crystal thickness. © 2022 The Authors

Place, publisher, year, edition, pages
Academic Press Inc. , 2022. Vol. 410, p. 320-332
Keywords [en]
Deactivation, Defects, Gasoline, H-ZSM-5, MTG
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-59216DOI: 10.1016/j.jcat.2022.04.013Scopus ID: 2-s2.0-85129698365OAI: oai:DiVA.org:ri-59216DiVA, id: diva2:1667499
Note

Funding details: Vetenskapsrådet, VR, 2014-04585_VR; Funding details: Energimyndigheten, P41164-1; Funding text 1: Financial support from the Swedish Research Council (2014-04585_VR) and Bio4energy are acknowledged. Swedish Energy Agency is acknowledged by financing part of the work (O. Öhrman) through grant ID P41164-1.

Available from: 2022-06-10 Created: 2022-06-10 Last updated: 2022-06-10Bibliographically approved

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