Endothermic Reforming Using Novel Catalysts Prepared by Exsolution
Abstract
Cooling of critical engine parts in hypersonic aircraft (above Mach 5) is challenging since air-cooling is not practical at such high velocities. While the fuel itself can be used to provide some cooling before it enters the combustion chamber, this approach is not sufficient to supply the required cooling load since the temperature to which the fuel can be heated is limited by gas phase pyrolysis reactions that have appreciable rates above 650C and produce tars that will foul the fuel lines. In the present contract period, we have explored two approaches aimed at achieving practical cooling using endothermic reactions. First, we have explored alternative fuels, demonstrating high heats and coking resistance for dehydrogenation of amines to nitriles over a zirconia catalyst and dehydrogenation of 1,2,3,4-tetrahydroquinoline to quinoline over a Pd/alumina catalyst. Second, since enhancing catalyst stability, especially preventing deactivation by coking resulting from decomposition of fuel molecules, will be required for endothermic reforming reactions, we also explored, both experimentally and computationally, the properties of metal catalysts prepared by ex-solution from perovskite supports which have been shown to exhibit tolerance against coking in previous work. In these studies, we explored the synthesis of this type of catalyst with high-surface-area perovskites prepared using Atomic Layer Deposition on stable supports and demonstrated that these materials maintain their high coking resistance. Computationally, we demonstrated that ex-solution processes are highly dependent on the composition of both the metal catalyst and the perovskite, as well as the crystallographic orientation of the perovskite.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 03, 2022
- Accession Number
- AD1185098
Entities
People
- Raymond J Gorte
Organizations
- University of Pennsylvania