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Effects of Ce/Zr ratio on the reducibility, adsorption and catalytic activity of CuO/CexZr1−xO2/γ-Al2O3 catalysts for NO reduction by CO

Paper ID Volume ID Publish Year Pages File Format Full-Text
47380 46470 2010 11 PDF Available
Title
Effects of Ce/Zr ratio on the reducibility, adsorption and catalytic activity of CuO/CexZr1−xO2/γ-Al2O3 catalysts for NO reduction by CO
Abstract

Effects of Ce/Zr ratio on the physicochemical properties of CuO/CexZr1−xO2/γ-Al2O3 catalysts were investigated by BET, XRD, Raman and H2-TPR. The catalytic activity and the interaction between the reactants with these catalysts were compared by NO + CO model reaction and in situ FT-IR. The results suggested that the addition of ceria–zirconia mixed oxides significantly improved NO conversion and N2 yield due to dispersed copper species in proximity to ceria–zirconia. Especially, the ceria-rich catalysts displayed better performance in activity and reducibility than others, which would be resulted from the strong interaction among copper, ceria–zirconia and support. The IR results suggested NO reduction activity was correlated with the presence of Cu+ carbonyl species, and the catalysts with variable Ce/Zr ratios had no distinction at the adsorption type and rate of NO/CO at room temperature. However, on heating treatment would give distinct difference in CO2 intensity and the wavenumber of adsorbed nitrates. Simultaneously, the stability of these N- and C-containing intermediates contacted with alumina was influenced by the modified Ce/Zr ratio.

Keywords
CuO/CexZr1−xO2/γ-Al2O3; NO + CO model reaction; H2-TPR; In situ FT-IR; Carbonate; Nitrate
First Page Preview
Effects of Ce/Zr ratio on the reducibility, adsorption and catalytic activity of CuO/CexZr1−xO2/γ-Al2O3 catalysts for NO reduction by CO
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 96, Issues 3–4, 7 June 2010, Pages 350–360
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis