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Isothermal desulfation of pre-sulfated Pt-BaO/γ-Al2O3 lean NOx trap catalysts with H2: The effect of H2 concentration and the roles of CO2 and H2O

Paper ID Volume ID Publish Year Pages File Format Full-Text
46481 46440 2012 7 PDF Available
Title
Isothermal desulfation of pre-sulfated Pt-BaO/γ-Al2O3 lean NOx trap catalysts with H2: The effect of H2 concentration and the roles of CO2 and H2O
Abstract

The desulfation mechanisms of pre-sulfated Pt-BaO/γ-Al2O3 lean NOx trap catalysts were investigated under isothermal conditions (600 °C) using H2 as the reductant. Sulfates were found to be reduced first with H2 to produce SO2, followed by a reaction between SO2 and H2 to produce H2S. Gas analysis during the rich pulse reveals that the sulfur removal efficiency is initially proportional to the H2 concentration. At constant H2 concentration the overall desulfation efficiency decreases in the order of H2/CO2/H2O > H2/CO2 > H2/H2O > H2, as confirmed by XPS analysis of residual sulfur in the desulfated samples. H2O limits the evolution of SO2 at an early stage of the rich pulse and enhances the production of H2S in later stages of reduction. CO2 is involved in both the formation of COS and the production of H2O (via the reverse water–gas shift reaction), therefore, resulting in an increased overall efficiency.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Sulfates were found to be reduced with H2 to produce SO2, followed by the formation of H2S. ► The sulfur removal efficiency is initially proportional to the H2 concentration, then leveled off. ► At constant H2 concentration the overall desulfation efficiency decreases in the order of H2/CO2/H2O > H2/CO2 > H2/H2O > H2. ► H2O enhances the production of H2S in later stages of reduction. ► CO2 is involved in both the formation of COS and the production of H2O.

Keywords
Pt-BaO/γ-Al2O3; SO2; Lean NOx trap; Desulfation; H2S; COS
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Isothermal desulfation of pre-sulfated Pt-BaO/γ-Al2O3 lean NOx trap catalysts with H2: The effect of H2 concentration and the roles of CO2 and H2O
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 342–348
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