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http://dx.doi.org/10.14478/ace.2020.1087

Development of Pd/TiO2 Catalysts with La2O3 Addition and Study on the Performance Improvement of H2 Oxidation at Room Temperature  

Lee, Dong Yoon (Department of Environmental Energy Engineering, Graduate School of Kyonggi University)
Kim, Sung Chul (Department of Environmental Energy Engineering, Kyonggi University)
Lee, Sang Moon (Department of Environmental Energy Engineering, Kyonggi University)
Kim, Sung Su (Department of Environmental Energy Engineering, Kyonggi University)
Publication Information
Applied Chemistry for Engineering / v.31, no.6, 2020 , pp. 674-678 More about this Journal
Abstract
In this study, a Pd/TiO2 catalyst which oxidized H2 at room temperature without an additional energy source was prepared. And a specific surface area of TiO2 as a support was not proportional to H2 oxidation reaction performance of Pd/TiO2 catalyst. In addition La2O3 was added to Pd/TiO2 catalyst in order to evaluate the performance effect due to the change of catalysts physical properties. A Pd/La2O3-TiO2 was prepared by adding different amounts of La2O3 to TiO2 and CO chemisorption analysis was performed. Compared to the conversion rate (14% at 0.5% H2) of the Pd/TiO2(G) catalyst, the Pd/La2O3-TiO2 catalyst showed 74% which was improved by more than five times. It was found that the larger the metal dispersion of Pd as an active metal is, the more favorable to H2 oxidation reaction is. However, when the added La2O3 amount exceeded 10%, the catalyst performance decreased again. Finally, it was concluded that the physical properties of the Pd/La2O3-TiO2 catalyst have a dominant influence on the catalytic activity until 0.3~0.5% of injected H2 concentrations and the catalyst reaction rate was controlled by substance transfer from 1% or more concentrations of H2.
Keywords
Pd; $TiO_2$; $La_2O_3$; $H_2$ oxidation; Physical property;
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