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Autor

  • Kraehnert, R. (3)
  • Paul, B. (3)
  • Eckhardt, B. (2)
  • Emmerling, Franziska (2)
  • Ortel, Erik (2)
  • Polte, J. (2)
  • Strasser, P. (2)
  • Antoniou, A. (1)
  • Bergmann, A. (1)
  • Bernsmeier, D. (1)
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Erscheinungsjahr

  • 2015 (2)
  • 2013 (1)

Schlagworte

  • Growth mechanism (1)
  • Hydrogenation of 1,3-butadiene (1)
  • Palladium nanoparticle (1)
  • Pt catalysts (1)
  • Pt–Si layers (1)
  • SAXS (1)
  • Scanning Electron Microscopy (SEM) (1)
  • Silver nanoparticles (1)
  • Size control (1)
  • Sodium borohydride (1)
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Organisationseinheit der BAM

  • 1 Analytische Chemie; Referenzmaterialien (2)
  • 1.3 Strukturanalytik (2)
  • 6 Materialschutz und Oberflächentechnik (2)
  • 6.1 Oberflächenanalytik und Grenzflächenchemie (2)

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Size-controlled synthesis of colloidal silver nanoparticles based on mechanistic understanding (2013)
Wuithschick, M. ; Paul, B. ; Bienert, Ralf ; Sarfraz, A. ; Vainio, U. ; Sztucki, M. ; Kraehnert, R. ; Strasser, P. ; Rademann, K. ; Emmerling, Franziska ; Polte, J.
Metal nanoparticles have attracted much attention due to their unique properties. Size control provides an effective key to an accurate adjustment of colloidal properties. The common approach to size control is testing different sets of parameters via trial and error. The actual particle growth mechanisms, and in particular the influences of synthesis parameters on the growth process, remain a black box. As a result, precise size control is rarely achieved for most metal nanoparticles. This contribution presents an approach to size control that is based on mechanistic knowledge. It is exemplified for a common silver nanoparticle synthesis, namely, the reduction of AgClO4 with NaBH4. Conducting this approach allowed a well-directed modification of this synthesis that enables, for the first time, the size-controlled production of silver nanoparticles 4–8 nm in radius without addition of any stabilization agent.
Pd/TiO2 coatings with template-controlled mesopore structure as highly active hydrogenation catalyst (2015)
Ortel, Erik ; Polte, J. ; Bernsmeier, D. ; Eckhardt, B. ; Paul, B. ; Bergmann, A. ; Strasser, P. ; Emmerling, Franziska ; Kraehnert, R.
Micro-structured reactors offer excellent mass and heat transport capabilities and can therefore sustain very high reaction rates and space–time-yields also for highly exothermic catalytic reactions. However, such high rates cannot be reached when the reactors are coated or filled with conventional catalysts powders. We present a strategy for the direct synthesis of highly active wall-coated supported catalysts via co-deposition of a pore template (here micelles formed from PEO-b-PPO-b-PEO) and a precursors for the metal oxide (TiCl4) along with a compatible precursor for the active metal (PdCl2). The obtained catalytic coatings possess a template-controlled open pore structure and excellent mechanical stability. Moreover, the active metal is highly dispersed and well-distributed across the coating also at high Pd loadings. The corresponding high activity along with rapid mass transfer enabled by the open pore system results in the best space–time-yields in the gas-phase hydrogenation of butadiene reported so far in literature for a supported catalyst.
Electrochemically dealloyed platinum with hierarchical pore structure as highly active catalytic coating (2015)
Kraehnert, R. ; Ortel, Erik ; Paul, B. ; Eckhardt, B. ; Kanis, M. ; Liu, R. ; Antoniou, A.
Micro structured reactors are attractive candidates for further process intensification in heterogeneous catalysis. However, they require catalytic coatings with significantly improved space-time yields compared to traditional supported catalysts. We report the facile synthesis of homogeneous nanocrystalline Pt coatings with hierarchical pore structure by electrochemical dealloying of amorphous sputter-deposited platinum silicide layers. Thickness, porosity and surface composition of the catalysts can be controlled by the dealloying procedure. XPS analysis indicates that the catalyst surface is primarily composed of metallic Pt. Catalytic tests in gas-phase hydrogenation of butadiene reveal the typical activity, selectivity and activation energy of nanocrystalline platinum. However, space time yields are about 13 to 200 times higher than values reported for Pt-based catalysts in literature. The highly open metallic pore structure prevents heat and mass transport limitations allowing for very fast reactions and reasonable stability at elevated temperatures.
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