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FT-IR study of the surface redox states on platinum-potassium-alumina catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46787 46449 2011 9 PDF Available
Title
FT-IR study of the surface redox states on platinum-potassium-alumina catalysts
Abstract

Pt-K/Al2O3 (Pt 1%; K 5.4% wt/wt) catalyst active for the simultaneous Diesel particulate oxidation and NOx reduction have been characterized in comparison with 1% Pt/Al2O3 catalyst. IR spectra of adsorbed CO at −140 °C and at room temperature allowed the detection of oxidized Pt centers and of their very strong oxidizing ability. TPD and IR spectra of adsorbed CO2 allowed to characterize the basicity of the samples. The data indicate that Pt centers lie in close proximity of potassium oxide species generating basicity.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The paper reports a detailed characterization of a catalyst constituted by platinum supported on heavily potassium doped γ-Al2O3 which is active in the so called NOx-trap technology and for the simultaneous Diesel particulate oxidation and NOx reduction. ► The characterization is made in comparison with a corresponding K-free Pt/Al2O3 catalyst. ► IR spectra of adsorbed CO at −140 °C and at room temperature allowed the detection of oxidized Pt centers and of their very strong oxidizing ability. ► TPD and IR spectra of adsorbed CO2 allowed to characterize the basicity of the samples. ► The data indicate that Pt centers lie in close proximity of potassium oxide species generating basicity.

Keywords
Platinum; Nanoparticles; IR spectroscopy; Adsorbed CO; Supported Pt catalysts; Potassium alumina; NOx adsorption and reduction; Catalytic combustion
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FT-IR study of the surface redox states on platinum-potassium-alumina catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 105, Issues 1–2, 9 June 2011, Pages 15–23
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
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Any Questions? feel free to contact us