University of Oulu

Zhivonitko, V. V., Vajglová, Z., Mäki-Arvela, P., Kumar, N., Peurla, M., Telkki, V.-V., & Murzin, D. Yu. (2022). Diffusion measurements of hydrocarbons in H-MCM-41 extrudates with pulsed-field gradient nuclear magnetic resonance spectroscopy. Physical Chemistry Chemical Physics, 24(14), 8269–8278.

Diffusion measurements of hydrocarbons in H-MCM-41 extrudates with pulsed-field gradient nuclear magnetic resonance spectroscopy

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Author: Zhivonitko, Vladimir V.1; Vajglová, Zuzana2; Mäki-Arvela, Päivi2;
Organizations: 1NMR Research Unit, University of Oulu, Oulu, Finland
2Åbo Akademi University, Johan Gadolin Process Chemistry Centre, Henriksgatan 2, Turku/Åbo, 20500, Finland
3Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, Turku, 20520, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4 MB)
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Language: English
Published: Royal Society of Chemistry, 2022
Publish Date: 2022-10-25


Mesoporous materials are promising catalysts for production of biofuels. Herein, H-MCM-41 catalysts with different concentrations of the silica Bindzil binder (10–50 wt%) were prepared and characterized using pulsed-field gradient (PFG) NMR in the powder form and as extrudates. Effective diffusion coefficients (De) are measured in all cases. Diffusivities of n-hexadecane were found smaller for extrudates as compared to the powder catalysts. The estimates of diffusive tortuosity were also determined. PFG NMR data showed one major component that reveals diffusion in interconnected meso- and micropores and one other minor component (1–2%) that may correspond to more isolated pores or may represent complex effects of restricted diffusion. Therefore, several approaches including initial slope analysis of spin-echo attenuation curves, two-component fitting and Laplace inversion were used to discuss different aspects of diffusional transport in the studied H-MCM-41 materials. Correlations between De and the amount of Bindzil, the specific surface area, the micropore volume, the particle size, the total acid sites and the Lewis acid sites are discussed.

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Series: PCCP. Physical chemistry chemical physics
ISSN: 1463-9076
ISSN-E: 1463-9084
ISSN-L: 1463-9076
Volume: 24
Issue: 14
Pages: 8269 - 8278
DOI: 10.1039/d2cp00138a
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors are grateful to Academy of Finland for funding through the project: Synthesis of spatially controlled catalysts with superior performance. VVZ and VVT acknowledge ERC (H2020/2018-2022/ERC Grant agreement No. 772110) and University of Oulu (Kvantum Institute) for the support. Electron microscopy samples were processed and analyzed in the Electron Microscopy Laboratory, Institute of Biomedicine, University of Turku, which receives financial support from Biocenter Finland.
EU Grant Number: (772110) UFLNMR - Ultrafast Laplace NMR
Copyright information: © the Owner Societies 2022. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.