One of the major goals of current research on energy conversion is the mitigation of CO 2 emission. A beneficial scenario for CO 2 utilization is the catalytic conversion of industrial waste or process gases into valuable products. Within the crossindustry approach of Carbon2Chem the synthesis of methanol from steel mill exhaust gases is a promising way to close the carbon cycle based on additional sustainably produced H 2 . New catalyst requirements have to be met due to fluctuating feed gas composition and availability as well as gas separation and purification issues.
An on‐site laboratory with direct access to cleaned and conditioned steel mill gases was recently put into operation. The long‐term performance and stability of Clariant's MegaMax®800 methanol synthesis catalyst utilizing steel mill gases is currently being investigated. First test results revealed that in order to investigate deactivation mechanisms arising from particular properties of the cleaned steel mill gases, the overlaying effect of thermal deactivation of the catalyst has to be minimized.
The utilization of CO2-containing steel-mill gases for synthesis of methanol was investigated. Four different scenarios with syngas derived from steel-mill gases were considered. A process model for an industrial methanol production including gas recirculation was applied to provide realistic conditions for catalyst performance tests. A long-term test series was performed in a close-to-practice setup to demonstrate the stability of the catalyst. In addition, the experimental results were used to discuss the quality of the simulation results. Kinetic parameters of the reactor model were fitted. A comparison of two different kinetic approaches and the experimental results revealed which approach better fits CO-rich or CO2-rich steel-mill gases.
In der Grundlagenforschung wird die Testung heterogener Katalysatoren normalerweise mit sehr kleinen Probenmengen durchgeführt. Eine Übertragung der ermittelten Ergebnisse hinsichtlich Produktivität und Standzeit auf den technischen Maßstab ist nur sehr eingeschränkt möglich. Es wurde ein neues praxisnahes Testsystem für heterogene Katalysatoren entwickelt. Es kann sowohl in Festbett‐Fahrweise als auch in Slurry‐Fahrweise in einem weiten Temperatur‐ und Druckbereich betrieben werden. Das System wurde für die Synthese höherer Alkohole und die einstufige Dimethylether‐Synthese erfolgreich eingesetzt.
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