An 1H NMR Microimaging Study of Water Vapor Sorption by Individual Porous Pellets | Sciact - CRIS-system of Boreskov Institute of Catalysis

An 1H NMR Microimaging Study of Water Vapor Sorption by Individual Porous Pellets Full article

Journal

The Journal of Physical Chemistry B
ISSN: 1520-6106 , E-ISSN: 1520-5207

Output data

Year: 2000, Volume: 104, Number: 8, Pages: 1695-1700 Pages count : 6 DOI: 10.1021/jp9922763

Tags

SELF-DIFFUSION MEASUREMENTS; MULTIPLE APPLICATIONS; SILICA-GEL; SOLVENT DIFFUSION; PORTLAND-CEMENT; RESONANCE; SORBENTS; KINETICS; VISUALIZATION; MICROSCOPY

Authors

Koptyug Igor V. ¹ , Khitrina Ludmila Yu. ² , Aristov Yurii I. ² , Tokarev Mikhail M. ² , Iskakov Kazizat T. ³ , Parmon Valentin N. ² , Sagdeev Renad Z. ¹

Affiliations

1	International Tomography Center, Institutskaya str. 3A, Novosibirsk 630090, Russia
2	Boreskov Institute of Catalysis, Acad. Lavrentiev pr. 5, Novosibirsk 630090, Russia
3	Karaganda State University, Universitetskaya str. 28, Karaganda 470012, Kazakhstan

Funding (4)

1	Russian Foundation for Basic Research	99-03-32314
2	Russian Foundation for Basic Research	99-03-32312
3	Siberian Branch of the Russian Academy of Sciences
4	Zamaraev International Charitable Scientific Foundation

The 1H NMR microimaging technique is applied to study water vapor sorption by the individual cylindrical silica gel and alumina pellets impregnated with hygroscopic salts. The two-dimensional images or the one-dimensional profiles of the sorbed water distribution are detected sequentially to monitor the transport of water within the pellets in real time in the course of the sorption process. The results identify the propagation of the sorbed water front through the dry regions of the pellets as the rate-limiting stage of the sorption process. This propagation can be facilitated by employing the pellets with the eggshell distribution of the salt, but in such cases the salt redistributes readily in the course of the sorption process, as revealed by the relaxation weighted 1H NMR microimaging experiments in which paramagnetic salts are used. The diffusion equation with water content dependent diffusivity is employed to model the one-dimensional radial profiles of water distribution within the pellet with appropriate correction for the relaxation weighting effects.

Koptyug I.V. , Khitrina L.Y. , Aristov Y.I. , Tokarev M.M. , Iskakov K.T. , Parmon V.N. , Sagdeev R.Z.
An 1H NMR Microimaging Study of Water Vapor Sorption by Individual Porous Pellets
The Journal of Physical Chemistry B. 2000. V.104. N8. P.1695-1700. DOI: 10.1021/jp9922763 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Jul 2, 1999
Accepted:	Oct 15, 1999
Published online:	Feb 3, 2000
Published print:	Mar 1, 2000

Web of science:	WOS:000085642000004
Scopus:	2-s2.0-0001266635
Elibrary:	44912070
Chemical Abstracts:	2000:83761
Chemical Abstracts (print):	132:199437
OpenAlex:	W1966034154

DB	Citing
Web of science	32
Scopus	34
Elibrary	35
OpenAlex	31