Refereed journal article or data article (A1)

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




List of AuthorsZhivonitko Vladimir V., Vajglova Zuzana, Mäki-Arvela Päivi, Kumar Narendra, Peurla Markus, Telkki Ville-Veikko, Murzin Dmitry Yu.

PublisherThe Royal Society of Chemistry

Publication year2022

JournalPhysical Chemistry Chemical Physics

Journal name in sourcePHYSICAL CHEMISTRY CHEMICAL PHYSICS

Journal acronymPHYS CHEM CHEM PHYS

Volume number24

Issue number14

Start page8269

End page8278

Number of pages10

ISSN1463-9076

eISSN1463-9084

DOIhttp://dx.doi.org/10.1039/d2cp00138a

URLhttps://pubs.rsc.org/en/content/articlelanding/2022/cp/d2cp00138a

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/174909031


Abstract
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 (D-e) 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 D-e 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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Last updated on 2022-16-05 at 15:25