A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Diffusion Measurements of Hydrocarbons in Zeolites with Pulse-Field Gradient Nuclear Magnetic Resonance Spectroscopy
Tekijät: Zhivonitko VV, Vajglová Z, Mäki-Arvela P, Kumar N, Peurla M, Murzin DY
Kustantaja: MAIK NAUKA/INTERPERIODICA/SPRINGER
Julkaisuvuosi: 2021
Journal: Russian Journal of Physical Chemistry A, Focus on Chemistry / Zhurnal fizicheskoi khimii
Tietokannassa oleva lehden nimi: RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
Lehden akronyymi: RUSS J PHYS CHEM A+
Vuosikerta: 95
Aloitussivu: 547
Lopetussivu: 557
Sivujen määrä: 11
ISSN: 0036-0244
DOI: https://doi.org/10.1134/S0036024421030250
Verkko-osoite: https://link.springer.com/article/10.1134/S0036024421030250
Rinnakkaistallenteen osoite: 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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
