Development Of Pd/Tio2 Catalysts With La2o3 Addition And Study On The Performance Improvement Of H-2 Oxidation At Room Temperature

In this study, a Pd/TiO2 catalyst which oxidized H-2 at room temperature without an additional energy source was prepared. And a specific surface area of TiO2 as a support was not proportional to H-2 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% H-2) 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 H-2 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 similar to 0.5% of injected H-2 concentrations and the catalyst reaction rate was controlled by substance transfer from 1% or more concentrations of H-2.