A1 Refereed original research article in a scientific journal
Diffusion Measurements of Hydrocarbons in Zeolites with Pulse-Field Gradient Nuclear Magnetic Resonance Spectroscopy
Authors: Zhivonitko VV, Vajglová Z, Mäki-Arvela P, Kumar N, Peurla M, Murzin DY
Publisher: MAIK NAUKA/INTERPERIODICA/SPRINGER
Publication year: 2021
Journal: Russian Journal of Physical Chemistry A, Focus on Chemistry / Zhurnal fizicheskoi khimii
Journal name in source: RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Journal acronym: RUSS J PHYS CHEM A+
Volume: 95
First page : 547
Last page: 557
Number of pages: 11
ISSN: 0036-0244
DOI: https://doi.org/10.1134/S0036024421030250
Web address : https://link.springer.com/article/10.1134/S0036024421030250
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/56360159
Pulse field gradient NMR technique was used to determine self-diffusivity of heptane and pentadecane at room temperature for microporous catalysts, used both as powders and shaped with a binder extrudates. The results showed that diffusivities increased with increasing specific surface area, micro- and mesopore volume of the studied catalysts. The presence of Bindzil binder together with H-Beta-25 decreased hydrocarbon diffusivities. Self-diffusivities of heptane and pentadecane were smaller for extrudates than for the powder catalysts. The detailed information about mass transfer limitations is needed to further process optimization since effective diffusivity is directly correlated with self-diffusion coefficients. The estimates of the ratio of porosity and tortuosity were also determined. The diffusion measurements with relatively long observation times Delta (20 up to 1000 ms) and catalysts fully immersed in pentadecane revealed that a small portion of sites exhibits very small diffusivities in H-Beta-25-Bindzil extrudates, which is correlated with a low ratio of mesopore to micropore volumes of this material.
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