Purification of water on solid catalysts having facet controlled metal nanoparticles

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Pt-Cu/Al_2O_3 was developed for catalytic reduction of harmful NO_<3^-> in surface water. Facet controlling of the platinum nanoparticles was shown to be effective on suppressing formation of side product NH_<4^+> ion. The facet controlled platinum nanoparticles were applied in the experiment using membrane reactor, which enables to process significant amount of water continuously, and the facet controlling effect was observed in this system, too. Selective deposition of cupper on Pt surface was also accomplished. These result revealed that facet controlled platinum nanoparticle is a possible way to improve the performance of catalytic reduction of NO_<3^-> in surface water.