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A better way to make efficient catalysts

By Edited by Gerald Ondrey |

A new procedure for making uniform, metallic nanoparticles has been developed by the research group of Kousuke Mori, an associate professor at Osaka University (www.mat.eng.osaka-u.ac.jp), with support from New Energy and Industrial Technology Development Organization (NEDO; Kawasaki, both Japan). The photo-assisted process, which uses ultraviolet (UV) light to deposit precursor metals onto active sites of a titanium substrate, is said to be less expensive and simpler than conventional impregnation methods, while producing smaller (1–3-nm dia.) particles with a controlled, narrow size distribution. The resulting nanoparticles exhibit enhanced catalytic properties; for example, a palladium catalyst with uniform diameters of 2 nm are found to be twice as active as those prepared by impregnation for the production of hydrogen peroxide from H2 and O2 in water. The catalytic activity is further enhanced by adding gold during the UV deposition, which leads to the formation of nanoparticles of Pd-Au alloy. The technique is applicable to precious metals, such as Pt, Pd and Au, and shows promise for reducing the environmental burden of solvent-based reactions, such as the anthraquinone route to H2O2.   Click here for a full pdf version…
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