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Supported Pd–Cu Nanoparticles for Water Phase Reduction of Nitrates. Influence of the Support and of the pH Conditions

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Institute of Physical Chemistry of the Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania
National Institute of Materials Physics, P.O. Box MG 7, 077125 Magurele, Romania
§ Research Center for Environmental Protection and Waste Management, University of Bucharest, Sos. Panduri 90, 050663 Bucharest, Romania
*Tel.:+40745043449. Fax: +40214105440. E-mail: [email protected]
Cite this: Ind. Eng. Chem. Res. 2014, 53, 49, 19094–19103
Publication Date (Web):November 17, 2014
Copyright © 2014 American Chemical Society

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    Pd–Cu nanoparticles were synthesized by the alkaline polyol method and further supported on alumina or titania. The nanoparticles show a crystalline Pd core and a shell rich in amorphous copper as was put in evidence by complex characterization methods (X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and CO chemisorption). The performances of as-prepared catalysts in the water phase reduction of nitrate were assessed in comparison with catalysts obtained by impregnation. Supported nanoparticle catalysts show a high activity in the reduction of nitrates, better than the impregnated catalysts. The importance of the support choice was discussed. The catalyst based on Pd–Cu nanoparticles supported on titania (PCT-np) is the most active, selective, and stable among those investigated. Also, the influence of pH conditions on the PCT-np catalyst performances was emphasized.

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