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SO2 poisoning of LaFe0.8Cu0.2O3 perovskite prepared by reactive grinding during NO reduction by C3H6

Paper ID Volume ID Publish Year Pages File Format Full-Text
43068 45953 2008 12 PDF Available
Title
SO2 poisoning of LaFe0.8Cu0.2O3 perovskite prepared by reactive grinding during NO reduction by C3H6
Abstract

Nanoscale LaFe0.8Cu0.2O3 was prepared by reactive grinding, characterized by XRD, SEM, H2-TPR, O2-, NO + O2-, and C3H6-TPD (with and without SO2), FTIR, tested for catalytic reduction of NO by C3H6 and aged in presence of SO2 to investigate the effect of sulfurous species on its catalytic behavior. Two distinct poisoning mechanisms depending on SO2 feed concentration were thus proposed. At low concentration SO2 (≤20 ppm) can cause a reversible poisoning due to the competitive adsorption of SO2 and reactants as well as the coverage of active sites by surface sulfite and sulfate species. By contrast, 80 ppm SO2 leads to a severe sulfatation with destruction of the perovskite structure and the generation of La2(SO4)3 and Fe2O3 phases resulting in an irreversible loss of activity in NO reduction by C3H6. Partial regeneration of this spent sample can be realized by releasing sulfur from the perovskite under a 5% H2/He atmosphere followed by reconstructing the perovskite structure under an oxygen containing atmosphere.

Graphical abstractSO2 poisoning of nanoscale LaFe0.8Cu0.2O3 during NO + C3H6 + O2 reaction was investigated. A reversible poisoning at SO2 ≤20 ppm was found. SO2 (80 ppm) leads to a destruction of the perovskite structure and an irreversible activity loss. Partial regeneration of this spent sample was realized by treating in 5% H2/He at 500 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Perovskite; Reactive grinding; NO reduction; Propene; SO2 poisoning; TPD; FTIR
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SO2 poisoning of LaFe0.8Cu0.2O3 perovskite prepared by reactive grinding during NO reduction by C3H6
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 340, Issue 1, 15 May 2008, Pages 140–151
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