TY - JOUR
T1 - Diffusion measurements of hydrocarbons in H-MCM-41 extrudates with pulsed-field gradient nuclear magnetic resonance spectroscopy
AU - Zhivonitko, Vladimir V.
AU - Vajglová, Zuzana
AU - Mäki-Arvela, Päivi
AU - Kumar, Narendra
AU - Peurla, Markus
AU - Telkki, Ville Veikko
AU - Murzin, Dmitry Yu
N1 - Funding Information:
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.
Publisher Copyright:
© 2022 The Royal Society of Chemistry
PY - 2022/4/14
Y1 - 2022/4/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85128134087&partnerID=8YFLogxK
U2 - 10.1039/d2cp00138a
DO - 10.1039/d2cp00138a
M3 - Article
C2 - 35319048
AN - SCOPUS:85128134087
SN - 1463-9076
VL - 24
SP - 8269
EP - 8278
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 14
ER -