Dry reforming and reverse water gas shift are often discussed as potential carbon dioxide sinks. They may in the near future act as enablers for improving carbon footprints of certain value chains. In this paper, it will be critically discussed in short format why both technologies can only be operated economically and sustainably in defined contexts. A number of technical and economic challenges of both reactions are discussed and potential solutions for technical realization are presented.

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.Die Entwicklung großtechnischer chemischer Prozesse kann insbesondere bei stark exothermen, heterogen katalysierten Reaktionen Herausforderungen und reaktionstechnische Limitierungen mit sich bringen. Am Beispiel zweier Reaktionen, der Methanol-und der direkten Dimethylether-Synthese, wird dies experimentell gezeigt. Hierzu dient der Vergleich der Ergebnisse aus Versuchsreihen in zwei verschiedenen Reaktorgrößen: Labor-und Technikums-Maßstab. Die vorgestellten Versuchsreihen umfassen die Variation zweier entscheidender Betriebsparameter: der Reaktionstemperatur und dem CO 2 -Anteil am Reaktoreintritt.Engineering of strongly exothermic heterogeneously catalyzed reactions to industrial size is challenging. Synthesis of methanol and direct dimethyl ether synthesis serve as example for such type of reactions and related experimental results are described. Results from laboratory as well as technical scale are provided. The experiments show the variation of two main operational parameters: reaction temperature and CO 2 content at reactor inlet.