DECHEMA

About: DECHEMA is a nonprofit organization based out in Frankfurt am Main, Germany. It is known for research contribution in the topics: Corrosion & Oxide. The organization has 756 authors who have published 1307 publications receiving 25693 citations.

Interdiffusion between the platinum-modified aluminide coating RT 22 and nickel-based single-crystal superalloys at 1000 and 1200°C

Abstract: Th e interdiffusion between the Pt-modified aluminide coating RT 22 and the single-crystal supera lloys CMSX-6 and SRR 99 has been investigated at 1000 and 1200°C up to 1600 h of exposure time in a...

Comparative investigations of packed and fluidized bed electrodes with non-conducting and conducting particles

Abstract: Current density-potential curves and the dependency of current density on flow velocity were measured for reaction systems which are controlled by diffusion in packed and fluidized bed electrodes with conducting and non-conducting particles. Analogous measurements were carried out with plane electrodes, and the corresponding dependencies of the current density factorib/ipl were determined. For bed electrodes with conducting particles, the current density factor can be approximately described as the product of a surface scale-up factor and a diffusion-controlled factor of the order of 5. Parallel to the current flow direction, the effectiveness of a bed electrode with conductive particles covers only a layer thickness of less than 1 cm. Maximum current densities are found with both conducting and non-conducting particles at flow velocities above the fluidization point.

Indirect electrosynthesis of p-methoxybenzaldehyde

Abstract: High current efficiency and selectivity were obtained in the indirect electrochemical oxidation ofp-methoxytoluene top-methoxybenzaldehyde with Ce4+/Ce3+ as redox mediator system. Platinized titanium anodes can be used for oxidant regeneration. Selectivity ofp-methoxybenzaldehyde synthesis has been optimized up to 98% by Plackett-Burman and factorial design of experiments. The kinetics ofp-methoxytoluene oxidation by Ce4+ with CH2Cl2 as organic solvent has been found to be of mixed mass transfer and kinetic control.