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- Title
Ein nanoporöser Goldschwamm als Katalysator: Nanomaterialien.
- Authors
Thayssen, Jan; Staubitz, Anne
- Abstract
Summary Nanoporous gold is a three‐dimensional, sponge‐like nanostructure that consists of ligaments and pores of about 5–60 nm in size. The porous material can be obtained by simple corrosion of an alloy of Au and a less noble metal such as silver or copper. By removing the e.g. Ag from the bulk material, the diffusing gold atoms start to form an ensemble of islands, mounts, and last, the ligaments. These can vary in size depending on the corrosion time and the initial alloy composition. npAu was proven to be a versatile heterogenous catalyst for both liquid and gas phase reactions. Due to a high density of atomic steps and kinks located on the curved surface of the ligaments as well as the presence of small amounts of residual silver in the material, the npAu is capable of activating molecular oxygen and binding it to its surface. This oxygen can then be used to oxidise several organic molecules such as CO, methanol or even larger organic alcohols. In the liquid phase, it was demonstrated that also hydrogen transfer reactions onto alkyne moieties are possible. Thereby, the overall activity and selectivity of npAu seems to strongly depend on its ligament size and the residual silver content. Even though catalytic research on npAu has been conducted already for more than 20 years, little is known about its overall potential. However, npAu tends to amaze the chemical community repeatedly becoming an even more captivating candidate for heterogenous catalysis every time.
- Subjects
HYDROGEN transfer reactions; GAS phase reactions; PRECIOUS metals; POROUS materials; CORROSION in alloys; GOLD alloys; SILVER alloys
- Publication
Chemie in unserer Zeit, 2022, Vol 56, Issue 2, p92
- ISSN
0009-2851
- Publication type
Article
- DOI
10.1002/ciuz.202000080