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Role of adsorption activation energy in heat change of irreversible dissociative adsorption with coverage on energetically heterogeneous solid surface

Paper ID Volume ID Publish Year Pages File Format Full-Text
42891 45945 2008 5 PDF Available
Title
Role of adsorption activation energy in heat change of irreversible dissociative adsorption with coverage on energetically heterogeneous solid surface
Abstract

The differential heat of gas adsorption on solid surface is often used to determine surface energy heterogeneity. In this paper, the theoretical analysis of irreversible dissociative adsorption on double-site surfaces shows that the change of differential adsorption heat with coverage is strongly dependent on the difference of adsorption activation energies between active sites. Furthermore, it was found that a discontinuous double-site surface can exhibit continuous changes of differential adsorption heat with coverage. This indicates that the distribution functions obtained from the relationship between differential adsorption heat and coverage may provide an incorrect characteristic of surface energetic heterogeneity.

Graphical abstractThe change of differential adsorption heat with coverage on double-site surface is strongly dependent on the difference of adsorption activation energies between active sites. Furthermore, a discontinuous double-site surface can exhibit continuous changes of differential adsorption heat with coverage. This indicates that the distribution functions obtained from the relationship between differential adsorption heat and coverage may provide an incorrect characteristic of surface energetic heterogeneity.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Irreversible dissociative adsorption; Heterogeneous solid surface; Coverage; Adsorption activation energy
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Role of adsorption activation energy in heat change of irreversible dissociative adsorption with coverage on energetically heterogeneous solid surface
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 347, Issue 1, 1 September 2008, Pages 50–54
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
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