Entwicklung eines optimalen CO2‐Abtrennungsprozesses für die oxidative Kopplung von Methan im Miniplant‐Maßstab

Oxidative coupling of methane (OCM) is a promising route for the production of ethylene by using natural gas. However, an industrial implementation still remains in its very early stage with the main efforts focused on the search for a sufficiently selective, active, and stable catalyst. During the OCM reaction, CO₂ is formed as unwanted by‐product and has to be separated in the downstream process. This affects the efficiency of the overall process significantly. For this purpose, an integrated gas treatment process for the CO₂ capture in a mini plant scale has been built.     

Mikrostrukturen für die katalytische Wasserstofferzeugung aus Ethanol

Hydrogen for fuel cell applications has been generated by catalytic steam reforming of ethanol in microstructures. The influence of reaction temperature, contact time and molar ratio steam to carbon (S/C) on the reaction has been investigated. The Co/ZnO catalyst coated on the microstructure showed high activity and selectivity. The hydrogen yield obtained was up to 5.2 mol mol^–1 ethanol. Ethanol has been completely converted at short contact time (W/F 25 g min mol^–1) and 600 °C at S/C ratio between 4.9 and 6.5.     

Entwicklung eines automatisierten Spuren–Matrix-Trennverfahrens für die Bestimmung von Spurenmetallen in hochreinem Titan und Titandioxid

Development of an Automated Trace-Matrix Separation Technique for the Determination of Trace Metals in Pure Titanium and Titaniumdioxide The determination of metal traces in pure titanium with ICP-AES or ICP-MS requires an effective trace-matrix separation technique to eliminate interferences. After digestion in HF and HNO₃ the traces can be separated from the matrix using a cation exchanger column. A computer controlled pumping system is used for the automatic control of the procedure of preconcentration, elution and determination. The method requires a minimum of chemical manipulation and reduces the risk of contamination by using only subboiled acids. Recovery rates of more than 90% and high precision are obtained for 16 analytes. For most of the elements detection limits in the range of 1 to 10 ng/g titanium can be achieved.