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Towards understanding reactive adsorption of small molecule toxic gases on carbonaceous materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
55477 47055 2012 9 PDF Available
Title
Towards understanding reactive adsorption of small molecule toxic gases on carbonaceous materials
Abstract

Reactive adsorption is a separation process based on physical adsorption of molecules, which is followed by their chemical transformations on the surface. This process is especially important for the removal of toxic industrial compounds (TICs) from air. At ambient conditions their adsorption is very weak and such factors as the presence of humidity have to be taken into account. This paper presents our approach leading to the design of efficient TICs adsorbents. In these materials the pores should be small enough to attract adsorbate molecules but sufficiently big to accommodate water or functional groups which participate in surface reactions. In these specific nanoreactors toxic species are either transformed to nontoxic and removed from the system or they are strongly retained on the surface via chemical bonds or as nonvolatile species. Surface chemistry is very important for these transformations. To start designing new separation media the physical properties of molecules and their chemical reactivity should be of paramount importance. After a separation performance test the battery of analytical methods has to be employed to characterize the surface of materials before and after reactive adsorption. The results obtained are then analyzed and the mechanism of adsorption is derived with the indication of surface features, which play a critical role in a particular separation process.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (162 K)Download as PowerPoint slideHighlights► This paper presents our approach leading to the design of the efficient TICs adsorbents. ► The pores should be small to attract small adsorbate molecules but big enough to accommodate water or functional group. ► To start designing new separation media the physical properties of molecules and their chemical reactivity should be of paramount importance. ► The battery of analytical methods to characterize the surface of materials before and after reactive adsorption has to be employed. ► After analysis of the results the mechanism of adsorption is derived.

Keywords
Reactive adsorption; Toxic industrial compounds; Surface chemistry; Porosity; Adsorption mechanism
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Towards understanding reactive adsorption of small molecule toxic gases on carbonaceous materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 186, Issue 1, 1 June 2012, Pages 20–28
Authors
,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us