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SCR of NOx by NH3 over model catalysts: The kinetic data-linear free energy relation

Paper ID Volume ID Publish Year Pages File Format Full-Text
50454 46795 2013 5 PDF Available
Title
SCR of NOx by NH3 over model catalysts: The kinetic data-linear free energy relation
Abstract

We propose a kinetic data-linear free energy relation (KDLFER) that links kinetics with thermodynamic parameters to obtain the activation energy and pre-exponential factor:equation(1)lnk=EaΔG°lnKeq+lnAThe correlation describes the influence of the Gibbs free-energy (∆G°) and equilibrium constant (Keq) upon rate constant (k) and activation energy (Ea). The correlation also identifies the contribution of the enthalpic and entropic terms upon activation energy. SCR of NOx by NH3 over V2O5–WO3/TiO2 model catalysts was used to obtain and compare the parameters of Arrhenius equation with respect to those reported in this work.For the SCR process, we found that activation energy from KDLFER is similar to that obtained from the Arrhenius equation. We also found that the enthalpic term has a strong influence on the activation energy, which suggests that the SCR system follows a dissociative mechanism. However, the factors that control the changes in magnitudes of Ea for a particular reaction-catalyst still remain unanswered.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We propose a kinetic data-linear free energy relation. ► Activation energy and pre-exponential factor can be obtained from our relation. ► We found that the Gibbs free-energy affects directly the activation energy. ► Rate constant is limited by the equilibrium conversion with temperature. ► The results are based on the SCR of NO by NH3 over V–W/TiO2 catalysts.

Keywords
SCR; Ammonia; NOx; Hammett equation; Linear free-energy relation
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SCR of NOx by NH3 over model catalysts: The kinetic data-linear free energy relation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 31, 10 January 2013, Pages 11–15
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
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Full-text PDF Download
Online Support
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