Goldkatalysatoren: Nanoporöse Gold‐Schwämme

Gold in a Metallic Divided State—From Faraday to Present‐Day Nanoscience

“…Debates as to the root cause of the remarkable catalytic performance of nanoparticle gold still rage, [29] as do the exciting new applications opened by its existence. [11] One cannot but feel that ever more critical experiments under in situ conditions in addition to quantum calculations are called for.…”

Nanostructured Materials as Catalysts: Nanoporous‐Gold‐Catalyzed Oxidation of Organosilanes with Water

“…We used the catalyst repeatedly (five times), but no significant loss of activity was observed. The product 2 a was obtained nearly quantitatively every time and the turnover number (TON) reached up to 10 700 (entries [1][2][3][4][5]. The catalytic oxidation reactions with a variety of organosilanes were then carried out (Table 2).…”

“…[2] More recently, nanoporous gold (AuNPore) nanostructured materials (C) has attracted much attention as sensors [3] and actuations, [4] and furthermore, some reactions have been catalyzed by nanoporous gold. [5][6][7] Silanols are useful building blocks for silicon-based polymeric materials [8] as well as nucleophilic coupling partners in organic synthesis.…”

Nanoporous Copper Metal Catalyst in Click Chemistry: Nanoporosity‐Dependent Activity without Supports and Bases

“…In spite of the growing number of studies on various applications of nanoporous metals, the catalytic properties in chemical reactions are still less explored, although the interesting features of nanoporous metals make them potentially attractive candidates for new heterogeneous catalysts; [1][2][3] the three-dimensional, open-pore network structures and metal ligaments allow the transport of molecules and ions, a high surface-to-volume ratio in comparison with bulk metals results in outstanding catalytic efficiency; furthermore, the potentially high reusability and rather simple work-up are favorable for practical synthetic methodology. Moreover, in contrast to the supported nanoparticles (NPs) catalyst, a nanoporous metal without supports should be a challenging catalyst system to understand the relevant catalytic mechanism more easily and to extend the catalytic application widely by elimination of the support effect problems and relaxation of aggregation.…”

“…The tunable nanoporosity of CuNPore led to a significant enhancement of catalytic activity in click chemistry without using any supports and bases. Characterization of CuNPore surface, high reusability, leaching experiment, and formation of nanostructured copper acetylide revealed that the click reaction occurred at the catalyst surface.Keywords: click reaction; heterogeneous catalysis; high reusability; nanoporous copper catalyst; tunable nanoporosity Nanoporous metals are promising materials for catalysis, [1][2][3] sensing, [4] and actuation [5] applications due to their interesting structural, optical and surface properties. In spite of the growing number of studies on various applications of nanoporous metals, the catalytic properties in chemical reactions are still less explored, although the interesting features of nanoporous metals make them potentially attractive candidates for new heterogeneous catalysts; [1][2][3] the three-dimensional, open-pore network structures and metal ligaments allow the transport of molecules and ions, a high surface-to-volume ratio in comparison with bulk metals results in outstanding catalytic efficiency; furthermore, the potentially high reusability and rather simple work-up are favorable for practical synthetic methodology.…”