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Nanoteilchen: Chemie mit komplexem Rhythmus
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Im Takt der Katalyse
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Chemical Reactions on Nanoparticle Surface are More Complex than Thought
Written by AZoNanoMay 24 2021
A majority of commercially available chemicals are created with the help of catalysts. Generally, such catalysts contain very small metal nanoparticles that are positioned on an oxidic support.
(a) Modern catalysts consist of nanoparticles. (b) A Rhodium tip as a model for a nanoparticle. (c) Tracing a chemical reaction in real time with a field emission microscope. (d) At low temperatures, different facets oscillate in sync. (e) At higher temperatures, synchronicity is broken. Image Credit: Vienna University of Technology.
A catalytic nanoparticle is analogous to a cut diamond, the surface of which contains varied facets that are oriented in various directions. Besides this, the nanoparticle has crystallographically different facets and such facets can have varied chemical characteristics.
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IMAGE: (a) Modern cataylsts constist of nanoparticles; (b) A Rhodium tip as a model for a nanoparticle; (c) Tracing a chemical reaction in real time with a field emission microscope (d). view more
Credit: TU Wien
Most of commercial chemicals are produced using catalysts. Usually, these catalysts consist of tiny metal nanoparticles that are placed on an oxidic support. Similar to a cut diamond, whose surface consists of different facets oriented in different directions, a catalytic nanoparticle also possesses crystallographically different facets - and these facets can have different chemical properties.
Until now, these differences have often remained unconsidered in catalysis research because it is very difficult to simultaneously obtain information about the chemical reaction itself and about the surface structure of the catalyst. At TU Wien (Vienna), this has now been achieved by combining different microscopic methods: with the help of field electron micro
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