Monitoring the Diffusivity of Light Hydrocarbons in a Mixture by Magic Angle Spinning Pulsed Field Gradient NMR: Methane/Ethane/Ethene in ZIF-8 | Sciact - CRIS-system of Boreskov Institute of Catalysis

Monitoring the Diffusivity of Light Hydrocarbons in a Mixture by Magic Angle Spinning Pulsed Field Gradient NMR: Methane/Ethane/Ethene in ZIF-8 Full article

Journal

The Journal of Physical Chemistry C
ISSN: 1932-7447 , E-ISSN: 1932-7455

Output data

Year: 2017, Volume: 121, Number: 45, Pages: 25372-25376 Pages count : 5 DOI: 10.1021/acs.jpcc.7b09335

Tags

Activation energy; Crystalline materials; Diffusion; Diffusion in liquids; Ethane; Ethylene; Hydrocarbons; Metal spinning; Methane; Microporosity; Mixtures; Organometallics

Authors

Dvoyashkina Nina ¹ , Freude Dieter ¹ , Arzumanov Sergei S. ^2,3 , Stepanov Alexander G. ^2,3

Affiliations

1	Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5, 04103 Leipzig, Germany
2	Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia
3	Department of Physical Chemistry, Faculty of Natural Sciences, Novosibirsk State University, Pirogova Street 2, Novosibirsk 630090, Russia

Funding (2)

1	German Research Foundation	HA 1893/16
2	Federal Agency for Scientific Organizations	0303-2016-0003

1H magic angle spinning pulsed field gradient (MAS PFG) NMR was applied for the measurement of the diffusivities in a three-component mixture of the light hydrocarbons methane, ethane, and ethene, which were absorbed in the micropores of ZIF-8 metal-organic framework (MOF). It has been found that diffusivity in the mixture increases in the order ethane < ethene < methane with variance of self-diffusion coefficients D from 0.22 × 10-10 m2 s-1 for ethane to 1.96 × 10-10 m2 s-1 for methane at 313 K. This tendency in increasing of diffusivity from ethane to methane is similar to the tendency for individual hydrocarbons. It is concluded that the interaction of a hydrocarbon with the micropore wall of the ZIF-8 framework influences the mobility rather than the intermolecular hydrocarbon interaction. The latter plays no role for the molecules, when they overcome the energy barrier of the window connecting neighbor cages. The activation energies Ea for diffusivity of the hydrocarbons in mixture increases in the order methane (Ea = 2.4 kJ mol-1) < ethene (Ea = 7.2 kJ mol-1) < ethane (Ea = 11.5 kJ mol-1). At the lowest studied temperature (273 K) D of methane is larger than D of ethane and ethene by 13.3 and 2.2 times, correspondingly, while the diffusivities of ethene and ethane differ by 5.8 times. This finding offers the possibility for separation of the three studied hydrocarbons on ZIF-8.

Dvoyashkina N. , Freude D. , Arzumanov S.S. , Stepanov A.G.
Monitoring the Diffusivity of Light Hydrocarbons in a Mixture by Magic Angle Spinning Pulsed Field Gradient NMR: Methane/Ethane/Ethene in ZIF-8
The Journal of Physical Chemistry C. 2017. V.121. N45. P.25372-25376. DOI: 10.1021/acs.jpcc.7b09335 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Sep 20, 2017
Accepted:	Oct 27, 2017
Published online:	Nov 3, 2017
Published print:	Nov 16, 2017

Web of science:	WOS:000416202900050
Scopus:	2-s2.0-85034665842
Elibrary:	31049883
Chemical Abstracts:	2017:1731850
OpenAlex:	W2766869235

DB	Citing
Web of science	18
Scopus	17
Elibrary	17
OpenAlex	18