Industrielle Anorganische Chemie

Threat to the Throne: Can Two Cooperating Boron Atoms Rival Transition Metals in Chemical Bond Activation and Catalysis?

“…Other than the H 2 transfer, the H − transfer requires the re‐reduction of 2 by an added alkali metal to complete the catalytic cycle. Given that many element halides would also react with this reducing agent, a temporal separation of the reduction/H 2 ‐activation steps from the H/Cl‐exchange step demands a repeated sequential addition of the three components to the reaction vessel (“alternating process management” analogous to the industrial anthraquinone process for the synthesis of H 2 O 2 from H 2 and O 2 [59] ).…”

Platinum‐Group Metals

“…In the very important Haber-Bosch process, Os-(and U-) compounds were first used by Bosch before World War I (Römpp 1990). Alloys which contain Pt, Rh and Pd in various ratios are used in form of very fine woven wire nets (wire 1 0.06 -0.072 mm) as catalysts for the catalytic oxidation of NH 3 in nitric acid production (Büschel et al 1999), whereby normal catalyst losses range from 0.05 to 0.35 g Pt per ton HNO 3 . According to the demand for PGM (see Table 20.3), approximately 40% of Pt, 75% of Pd and 95% of Rh are nowadays used for automobile catalysts.…”

Formation and Characterization of the (η2-N2)Sc(H)OH and (η-NN)xSc(H)OH (x = 1, 2) Complexes in Solid Argon

“…This a′′ orbital is also polarized away from the H and O atoms. It can interact with the π g antibonding orbitals of N 2 in either end-on ((η 1 1923.8, 1921.7, 1919.3, 1913.1, and 1904.4 cm -1 were identified. These spectral features imply that the two nitrogen atoms in each N 2 subunit are inequivalent, and the molecule involves a Sc(NN) 2 subunit.…”