Rationally designed laterally-condensed-catalysts deliver robust activity and selectivity for ethylene production in acetylene hydrogenation
Zehua Li, F. Eylul Sarac Oztuna, Katarzyna Skorupska, Olga V. Vinogradova, Afshan Jamshaid, Alexander Steigert, Christian Rohner, Maria Dimitrakopoulou, Maurício J. Prieto, Christian Künkel, Matuš Stredansky, Pierre Kube, Michael Götte, Alexandra M. Dudzinski, Frank Girgsdies, Sabine Wrabetz, Wiebke Frandsen, Raoul Blume, Patrick Zeller, M. Muske, Daniel Delgado, Shan Jiang, Franz Schmidt, Tobias Köhler, Manuela Arztmann, Anna Efimenko, Johannes Frisch, Tathiana Midori Kokumai, Raul Garcia‐Diez, Marcus Bär, Adnan Hammud, Jutta Kröhnert, Annette Trunschke, Christoph Scheurer, Thomas Schmidt, Thomas Lunkenbein, Daniel Amkreutz, H. Kuhlenbeck, Vanessa J. Bukas, Axel Knop‐Gericke, Rutger Schlatmann, Karsten Reuter, Beatriz Roldán Cuenya, R. Schlögl
Abstract
Abstract Future carbon management strategies require storage in elemental form, achievable through a sequence of CO 2 hydrogenation reactions. Hydrogen is recycled from molecular intermediates by dehydrogenation, and side product acetylene selectively hydrogenated to ethylene. Existing Pd alloy catalysts for gas purification underperform in concentrated feeds, necessitating novel concepts. Atomistic simulations unveil superior selectivity of Pd:C solid solutions that optimize chemisorption energies and preclude sub-surface hydrides, verified here with model thin films. Multiple design criteria deduced from conventional catalysts facilitate synthesizing a self-repairing Pd:C system of a laterally condensed catalyst (LCC). A Pd layer prepared on a designated SiO 2 buffer layer enables control of reactive interface, sub-surface volume and extended functional interface towards the buffer. Function and metric are supervised by operando micro-spectroscopy. This catalyst design shows, ethylene productivity >1 kmol C2H4 /g Pd /hour is reproducibly achieved and benchmarked against known catalysts. Photovoltaics deposition technologies enable scalability on real-world substrates saving active metal. A design-of-experiment approach demonstrates the improvement potential of the LCC approach.