1. FT-IR study of the surface redox states on platinum-potassium-alumina catalysts
- Author
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Montanari, Tania, Matarrese, Roberto, Artioli, Nancy, and Busca, Guido
- Subjects
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FOURIER transform infrared spectroscopy , *OXIDATION-reduction reaction , *PLATINUM catalysts , *ALUMINUM oxide , *DIESEL motor exhaust gas , *CARBON monoxide , *NITROGEN oxide absorption & adsorption , *NANOPARTICLES , *TEMPERATURE effect , *CATALYST supports - Abstract
Abstract: Pt-K/Al2O3 (Pt 1%; K 5.4% wt/wt) catalyst active for the simultaneous Diesel particulate oxidation and NO x 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. [Copyright &y& Elsevier]
- Published
- 2011
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