Pore volume probing of boron-modified MCM-22 zeolite by quartz crystal microbalance assisted study of o- and p-xylene adsorption

A quartz crystal microbalance device (QCM) has been developed and tested in the sorption kinetics of o- and p-xylenes over [Al]MCM-22 and boron-modified [Al,B]MCM-22 zeolites. The results have been compared to those obtained by the GC pulse method. The B-modified MCM-22 material exhibits lower rate...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2010-08, Vol.149 (2), p.389-394
Main Authors: Kolev, I., Mavrodinova, V., Alexieva, G., Strashilov, V.
Format: Article
Language:English
Subjects:
[Al]MCM-22 and [Al,B]MCM-22 zeolites
Actuators
Adsorption
Hydrocarbons
Isomers
Microorganisms
p- and o-xylene adsorption
Porosity
Quartz crystal microbalance (QCM)
Quartz crystals
Toluene disproportionation
Transformations
Zeolites
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Summary:A quartz crystal microbalance device (QCM) has been developed and tested in the sorption kinetics of o- and p-xylenes over [Al]MCM-22 and boron-modified [Al,B]MCM-22 zeolites. The results have been compared to those obtained by the GC pulse method. The B-modified MCM-22 material exhibits lower rate and capacity towards adsorption of both isomers which is attributed to a decrease in its pore volume and narrowing of the pore openings as a result of the introduction of boron into the zeolite framework. On the basis of these adsorption measurements suggestions have been made about the impact of the pore topology and the mass-transfer effects on the catalytic behavior of both studied materials. From this point of view the results obtained during transformations of different aromatic hydrocarbons used as test reactants have been discussed.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2010.06.044