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KMID : 1024520130220010073
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Journal of the Environmental Sciences
2013 Volume.22 No. 1 p.73 ~ p.81
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Low-temperature Reduction of N2O by H2 over Pt/SiO2 Catalysts
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Kim Moon-Hyeon
Kim Dae-Hwan
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Abstract
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The present work has been devoted to the catalytic reduction of N2O by H2 with Pt/SiO2 catalysts at very low temperatures, such as 110o C, and their nanoparticle sizes have been determined by using H2-N2O titration, X-ray diffraction(XRD) and high-resolution transmission electron microscopy(HRTEM) measurements. A sample of 1.72% Pt/SiO2, which had been prepared by an ion exchange method, consisted of almost atomic levels of Pt nanoparticles with 1.16 nm that are very consistent with the HRTEM measurements, while a Pt/SiO2 catalyst possessing the same Pt amount via an incipient wetness technique did 13.5 nm particles as determined by the XRD measurements. These two catalysts showed a noticeable difference in the on-stream deN2O activity maintenance profiles at 110o C. This discrepancy was associated with the nanoparticle sizes, i.e., the Pt/SiO2 catalyst with the smaller particle size was much more active for the N2O reduction. When repeated measurements of the N2O reduction with the 1.16 nm Pt catalyst at 110o C were allowed, the catalyst deactivation occurred, depending somewhat on regeneration excursions.
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KEYWORD
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Nitrous oxide(N2O), N2O reduction, Hydrogen(H2), Low temperature, Pt nanoparticles
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