Very unusual atomic states are produced at TU Wien: Ions are created by removing not just one but 20 to 40 electrons from each atom. These “highly charged ions” play an important role in current r .
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
New Catalyst for Lower CO2 Emissions Details
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If the CO2 content of the atmosphere is not to increase any further, carbon dioxide must be converted into something else.
If the CO2 content of the atmosphere is not to increase any further, carbon dioxide must be converted into something else. However, as CO2 is a very stable molecule, this can only be done with the help of special catalysts. The main problem with such catalysts has so far been their lack of stability: after a certain time, many materials lose their catalytic properties.
At TU Wien, research is being conducted on a special class of minerals - the perovskites, which have so far been used for solar cells, as anode materials or electronic components rather than for their catalytic properties. Now scientists at TU Wien have succeeded in producing a special perovskite that is excellently suited as a catalyst for converting CO2 into other useful substances, such as synthetic fuels. T
Credit: TU Wien
If the CO2 content of the atmosphere is not to increase any further, carbon dioxide must be converted into something else. However, as CO2 is a very stable molecule, this can only be done with the help of special catalysts. The main problem with such catalysts has so far been their lack of stability: after a certain time, many materials lose their catalytic properties.
At TU Wien, research is being conducted on a special class of minerals - the perovskites, which have so far been used for solar cells, as anode materials or electronic components rather than for their catalytic properties. Now scientists at TU Wien have succeeded in producing a special perovskite that is excellently suited as a catalyst for converting CO2 into other useful substances, such as synthetic fuels. The new perovskite catalyst is very stable and also relatively cheap, so it would be suitable for industrial use.