کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
43068 45953 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
SO2 poisoning of LaFe0.8Cu0.2O3 perovskite prepared by reactive grinding during NO reduction by C3H6
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
SO2 poisoning of LaFe0.8Cu0.2O3 perovskite prepared by reactive grinding during NO reduction by C3H6
چکیده انگلیسی

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.

SO2 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 as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 340, Issue 1, 15 May 2008, Pages 140–151
نویسندگان
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