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Influence of reducing agent (CO, H2, and C2H4) and of H2O on NOx reduction on a Pt-Ba/γ-Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
43418 45969 2007 7 PDF Available
Title
Influence of reducing agent (CO, H2, and C2H4) and of H2O on NOx reduction on a Pt-Ba/γ-Al2O3 catalyst
Abstract

In this paper, a comparative study on the NOx reduction/regeneration capabilities at 300 °C of a Pt-Ba/γ-Al2O3 catalyst is presented. Different reductants (H2, CO, and C2H4) are used in the absence and presence of H2O in the rich phase. Lean/rich cycling experiments show that in the absence of H2O both H2 and C2H4 are capable of reducing all the stored NOx, although C2H4 poisons the Pt sites by carbon decomposition. CO not only poisons the catalyst through carbon decomposition but also through formation of strongly bound isocyanates on barium sites. These isocyanates are removed by O2 in the lean phase. The type of reducing agent also affects the NOx storage route in the lean phase. H2O in the rich phase prevents poisoning of the catalyst by CO and C2H4, and all three reducing agents show comparable reduction efficiencies.

Graphical abstractNOx reduction/regeneration of Pt-Ba/γ-Al2O3 catalyst is studied, using H2, CO, and C2H4 as reductant in the absence and presence of H2O in the rich phase. Without H2O, H2 and C2H4 are capable of reducing all stored NOx. Pt sites are poisoned by C2H4 and CO through carbon decomposition, and, for CO, also through formation of isocyanates. H2O in the rich phase prevents poisoning, and all three reductants show comparable efficiencies. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
NOx reduction; Lean-burn; H2; CO; C2H4; Pt-Ba/γ-Al2O3 catalyst
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Influence of reducing agent (CO, H2, and C2H4) and of H2O on NOx reduction on a Pt-Ba/γ-Al2O3 catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 332, Issue 1, 1 November 2007, Pages 1–7
Authors
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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