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http://dx.doi.org/10.7464/ksct.2019.25.4.294

A Study on the Characteristics of CO Oxidation by NO Poisoning in Pt/TiO2 Catalyst  

Kim, Min Su (Department of Environmental Energy Engineering, Graduate school of Kyonggi University)
Kim, Se Won (Thermochemical Energy System Group, Korea Institute of Industrial Technology)
Hong, Sung Chang (Department of Environmental Energy Engineering, Kyonggi University)
Publication Information
Clean Technology / v.25, no.4, 2019 , pp. 296-301 More about this Journal
Abstract
This study was conducted to investigate the characteristics of CO oxidation by NO poisoning in Pt/TiO2 catalyst prepared by wet impregnation method and calcined at 400 ℃. In order to confirm the NO poisoning effect of the Pt/TiO2 catalyst, the change of reaction activity was observed when NO was injected during the CO+O2 reaction where it was ascertained that the CO conversion rate rapidly decreased below 200 ℃. Also, CO conversion was not observed below 125 ℃. Recovery of initial CO conversion was not verified even if NO injection was blocked at 125 ℃. Accordingly, various analyses were performed according to NO injection. First, as a result of the TPD analysis, it was confirmed that NO pre-adsorption in catalyst inhibited CO adsorption and conversion desorption from adsorbed CO to CO2. When NO was pre-adsorbed, it was confirmed through H2-TPR analysis that the oxygen mobility of the catalyst was reduced. In addition, it was validated through FT-IR analysis that the redox cycle (Pt2+→Pt0→Pt2+) of the catalyst was inhibited. Therefore, the presence of NO in the Pt/TiO2 catalyst was considered to be a poisoning factor in the CO oxidation reaction, and it was determined that the oxygen mobility of the catalyst is required to prevent NO poisoning.
Keywords
CO oxidation catalyst; NO; poisoning; $Pt/TiO_2$;
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