Kern-Schale-Katalysatorpellets: Das Gelbe vom Ei für den lastflexiblen Festbett-Reaktorbetrieb? Core-Shell Catalyst Pellets: The Egg Yolk for Load-Flexible Reactor Operation?

In the Power-to-X concept, wall-cooled fixed-bed tubular reactors will take on a central role in carrying out exothermic, heterogeneously catalyzed reactions. In order to achieve high product yields without overheating the reactors, effective heat management is required, especially for load-flexible operation. One solution for this is the use of core-shell catalyst pellets. In core-shell catalyst pellets, the catalytically active material is separated from the gas bulk by an inert shell (e.g. ‘egg white’ or ‘egg yolk’ pellets). The advantages and disadvantages of this concept are discussed in this article on the basis of analytical equations as well as experimental results on the laboratory and pilot scales, and compared with other concepts.