Papers by Keyword: Pd-Cu Catalyst

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Authors: Hong Yuan Liu, Yan Zhang
Abstract: Groundwater polluted by nitrate contaminant is becoming a critical issue in China and worldwide. Catalytic denetrification of nitrate over Pd-Cu bimetallic catalyst shows a potential technique for the removal of nitrate from groundwater. In this study, a series of reduction experiments using γ-Al2O3 supported Pd-Cu particle catalysts in a batch slurry reactor were carried out. A tentative reaction mechanism and the dynamic model for catalytic nitrate reduction were discussed. It was found that nitrate consumption is based on the conventional Langmuir-Hinshelwood kinetic approach, assuming an irreversible bimolecular surface reaction between adsorbed reactant species to be the rate-controlling step. The equilibrium hydrogen adsorption constant Kads and the apparent surface reaction rate constant kapp were equal to 5.11×10-2 l/mg and 48.31mg/(l.gcat.min) at 293K temperature, respectively. The apparent activation energy for catalytic nitrate reduction, in the temperature range 280-298K, was found to be 36.8kJ/mol. The low value of activation energy obtained in this work confirms the very high effective and suitability of Pd-Cu catalysts for nitrate reduction.
Authors: Yu Jun Zhang, Jing Chao Zhang, Sha Li Tan, Xun Yan Tan
Abstract: Nanometer CeO2 with the mean size of 15 nm is prepared by sol-gel method, and the CO catalytic oxidation activity of Pd-Cu catalysts with three kinds of CeO2 supports was studied. The results show that nanometer CeO2 supported Pd-Cu catalyst gives highest activity for CO oxidation. It can maintain CO complete conversion at about 40°C.
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