Detecting and utilizing minority phases in heterogeneous catalysis

Detecting and utilizing minority phases in heterogeneous catalysis

Highly active phases in carbon monoxide oxidation are known, however they are transient in nature. Here, we determined for the first time the structure of such a highly active phase on platinum nanoparticles in an actual reactor. Unlike generally assumed, the surface of this phase is virtually free of adsorbates and co-exists with carbon-monoxide covered and surface oxidized platinum. Understan...

Model studies in heterogeneous catalysis.

I review a concept that models heterogeneous catalysis based on a surface-science approach. It is shown that models catching part of the complexity of the real system, which is connected with the finite size of active components and the flexibility of the arrangement of atoms in the active component, play an important part in determining the activity and selectivity of the system. I have chosen...

Heterogeneous Catalysis and Solid Catalysts

Heterogeneous asymmetric catalysis*

Examples of enantioselective catalysts, including homogeneous supported catalysts and biphasic liquid/liquid, are described and compared. In the case of asymmetric hydride transfer, polythiourea was proven to be more efficient for ruthenium-catalyzed reduction of aryl ketones, although the iridium complexes gave rise to higher ee when using amino sulfonamide bound to a polystyrene matrix. In th...

Detecting Phases of Iron

plasmid pNV11 [H. Shibuya et al., Nature 357, 700 (1992)]. SHO1 is an SH3 domain–containing transmembrane osmosensor that constitutes another signaling pathway leading to hyperosmolarity responses by way of HOG1 activation independently of SSK2 or SSK22 (13). Single or double mutant strains of SHO1, SSK2, or SSK22 are resistant to hyperosmotic medium; however, strains with defects in SHO1, SSK2...