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Design of bifunctional catalysts for nitrogen(I), (II) oxides reduction by C1-, C3–C4-hydrocarbons at H2O and SO2 presence

Paper ID Volume ID Publish Year Pages File Format Full-Text
55281 47046 2012 8 PDF Available
Title
Design of bifunctional catalysts for nitrogen(I), (II) oxides reduction by C1-, C3–C4-hydrocarbons at H2O and SO2 presence
Abstract

Results of design of metal oxide (Co, Cr, Ce, In, Fe) catalysts including those doped with Rh (Pd) supported on ZrO2, Al2O3, H-ZSM-5 and their binary compositions for reduction of NO, N2O by C1, C3–C4-hydrocarbons and CO in gas flows containing oxygen, H2O and SO2, are presented. SCR-activity of Co–In-oxide catalysts towards NO depends on the nature of support and the sequence of active components’ application, and the catalysts (In2O3–CoO)/ZrO2 exhibit high resistance against moisture and sulfur dioxide. In combined reduction of nitrogen(I), (II) oxides with C3–C4 alkanes (SCR-conditions) at 400–450 °C, higher conversions for NO (60–78%) were observed on the Co-containing catalysts, whereas for N2O (90–95%) – on the Fe-containing ones supported on the H-ZSM-5. Composites over structured support Pd/Co3O4–CeO2/cordierite showed high activity in NO + N2O + CO reactions (95–99% conversion of N2O and NO at 200–300 °C) in the presence of H2O.

Graphical abstractDependence of NO conversion on the chemical composition of the binary carrier of CoO applied catalysts: ZrO2-H-ZSM-5 (310 °C) (a); ZrO2–Al2O3 (300 °C) (b): 1 – experimental curve; 2 – calculated curve for direct additivity.Figure optionsDownload full-size imageDownload high-quality image (122 K)Download as PowerPoint slideHighlights► Design of oxide (Co, In, Fe) catalysts doped with Rh (Pd) supported on ZrO2, Al2O3, H-ZSM-5 for reduction of NO, N2O by C1, C3–C4-hydrocarbons and CO in the gas mixes containing O2, H2O and SO2. ► High SCR-activity of the catalysts (In2O3–CoO)/ZrO2 with high tolerance to H2O and SO2 are achieved. ► In SCR of nitrogen(I), (II) oxides with C3–C4 alkanes, higher conversions for NO are achieved over CoO whereas for N2O – over Fe2O3 supported catalysts. ► High activity of Pd/(Co3O4–CeO2)/cordierite composites in N2O (+NO) + CO (+H2O) reactions is shown.

Keywords
NO, N2O; C1-, C3–C4-hydrocarbons; SCR; Cobalt, iron, indium oxides; ZrO2, Al2O3, H-ZSM-5; Surface acidity
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Design of bifunctional catalysts for nitrogen(I), (II) oxides reduction by C1-, C3–C4-hydrocarbons at H2O and SO2 presence
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 191, Issue 1, 15 September 2012, Pages 79–86
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
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