Catalysis by metallic and oxidic nanoparticles in aqueous solutions: Model Reactions
发布时间:2016-06-13   访问次数:284   作者:

报告题目:Catalysis by metallic and oxidic nanoparticles in aqueous solutions: Model Reactions

开始时间:2016-06-15   13:30-14:30


报 告 人: Matthias BallauffHelmholtz-Zentrum Berlin, Germany


    要:Metallic nanoparticles have been the subject of intense research since they can be used as catalysts for various chemical reactions.1,2 Gold nanoparticles provides perhaps the best-studied example: As a bulk metal, gold is inert but becomes an active catalyst if divided down to the nanoscale.3 We have recently presented the synthesis and characterization of hybrids from polymer colloids and metallic or oxidic nanoparticles.4,5 These systems are prepared in aqueous phase and present excellent and stable catalysts (see lecture of Yan Lu). In the course of this work we studied the catalytic activity of various metal nanoparticles. For this purpose we need well-controlled model reactions6 that allow us to obtain precise kinetic data that lead to a meaningful comparison of different nanoparticles.

In my lecture I’ll present our recent results related to model reactions. In particular, I’ll present results on i) the reduction of p-nitrophenol by borohydride ions in aqueous solutions, catalyzed by nanoparticles7,8, and ii) the oxidation of tetramethylbezidine by hydrogen peroxide, catalyzed by metallic and oxidic nanoparticles. In both cases we arrive at full kinetic schemes and can present a detailed mechanism of catalysis.