University of Oulu

Zhivonitko, V.V., Vajglová, Z., Mäki-Arvela, P. et al. Diffusion Measurements of Hydrocarbons in Zeolites with Pulse-Field Gradient Nuclear Magnetic Resonance Spectroscopy. Russ. J. Phys. Chem. 95, 547–557 (2021). https://doi.org/10.1134/S0036024421030250

Diffusion measurements of hydrocarbons in zeolites with pulse-field gradient nuclear magnetic resonance spectroscopy

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Author: Zhivonitko, V. V.1; Vajglová, Z.2; Mäki-Arvela, P.2;
Organizations: 1NMR Research Unit, University of Oulu, Oulu, Finland
2Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Turku, Finland
3Laboratory of Electron Microscopy, University of Turku, Turku, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021041510564
Language: English
Published: Springer Nature, 2021
Publish Date: 2021-04-15
Description:

Abstract

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 Δ (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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Series: Russian journal of physical chemistry. A, Focus on chemistry
ISSN: 0036-0244
ISSN-E: 1531-863X
ISSN-L: 0036-0244
Volume: 95
Pages: 547 - 557
DOI: 10.1134/S0036024421030250
OADOI: https://oadoi.org/10.1134/S0036024421030250
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
Subjects:
Copyright information: © Pleiades Publishing, Ltd., 2021.