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Transient reaction analysis and steady-state kinetic study of selective catalytic reduction of NO and NO + NO2 by NH3 over Fe/ZSM-5

Paper ID Volume ID Publish Year Pages File Format Full-Text
42759 45940 2009 9 PDF Available
Title
Transient reaction analysis and steady-state kinetic study of selective catalytic reduction of NO and NO + NO2 by NH3 over Fe/ZSM-5
Abstract

The reaction kinetics of selective catalytic reduction (SCR) by NH3 on NO (standard SCR) and on NO + NO2 (fast SCR) over Fe/ZSM-5 were investigated using transient and steady-state analyses. In the standard SCR, the N2 production rate was transiently promoted in the absence of gaseous NH3; this enhancement can be attributed to the negative reaction order of NH3 (between −0.21 and −0.11). The steady-state data for the standard SCR could be fit to a Langmuir–Hinshelwood-type reaction between NOad and Oad to form NO2. In the fast SCR, however, the promotion behavior in the absence of gaseous NH3 was not observed and the apparent NH3 order changed from positive to negative with NH3 concentration. The steady-state rate analysis combined with elementary reaction modeling suggested that competitive adsorption between NO2 and NH3 was occurring due to strong NO2 adsorption; this must be the main reason for the absence of the promotion effect.

Graphical abstractThe reaction kinetics of SCRs by NH3 on NO (standard SCR) and NO + NO2 (fast SCR) over Fe/ZSM-5 were investigated. Although the standard SCR was transiently promoted in the absence of gaseous NH3, the fast SCR was not. The steady-state rate analysis combined with modeling suggested that competitive adsorption between NO2 and NH3 was occurring in the fast SCR.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Selective catalytic reduction; Nitric oxide; Zeolite; Fe; Reaction mechanism
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Transient reaction analysis and steady-state kinetic study of selective catalytic reduction of NO and NO + NO2 by NH3 over Fe/ZSM-5
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 366, Issue 1, 15 September 2009, Pages 84–92
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us