Münster 2017 – wissenschaftliches Programm

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AKE: Arbeitskreis Energie

AKE 8: Sector Coupling, Chemical Conversion and Storage of Renewable Energy

AKE 8.5: Vortrag

Dienstag, 28. März 2017, 12:45–13:00, S Aula

Synthesis of Methanol from CO2 for Power-to-Liquid applications — •Fabian Rachow, Moritz Hagendorf, Klaus Müller, and Dieter Schmeißer — Brandenburgische Technische Universität Cottbus - Senftenberg, Angewandte Physik-Sensorik, Konrad-Wachsmann-Allee 17, 03046 Cottbus, Germany

The direct synthesis of methanol [CO2 + 3H2CH3OH + H2O] represent a possibility to reduce the global CO2-emission by recycling the CO2 and also to store excess energy from renewable energy sources into a common fuel or chemical feedstock (Power-to-Liquid). For an acceptable conversion rate of CO2 a catalyst is needed, together with high temperatures (>200C) and high pressure (50-200bar). Methanol is normally produced form synthesis gas, a mixture of CO and H2. By directly using CO2 for the exothermic reaction, we avoid the conversion of CO2 to CO by the reversed water gas shift reaction. We also present new concepts for the conversion from CO2-rich flue gases, eliminating the need for a separation of the CO2. The concept is backed up by measurements in laboratory scale. Here we use a CuZnO catalyst on a ZrO2 substrate prepared by impregnation and compare the results with commercially available catalysts. We achieved a conversion of around 7% and a selectivity of 60% at a temperature of 240C and 45bar. The reaction is thermodynamically limited with a maximum conversion rate of 15% at 250C and 50bar. The conversion and the selectivity towards methanol is highly influenced by the catalyst used, the temperature, the pressure as well as the flow rate of the reactants.

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