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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Single atom alloys 2.0: Exploiting undercoordination for stronger dissociative CH4 chemisorption
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Mechanochemical Kilogram-Scale Synthesis of Noble Metal Single-Atom Catalysts
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Imaging Conductivity in a Single Atomic Layer
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Structural Analysis of Single-Atom Catalysts by X-ray Absorption Spectroscopy
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Single Atom Substitution Alters the Polymorphic Transition Mechanism in Organic Electronic Crystals
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Mitigating SO2 Poisoning Effect in Electrochemical CO2 Reduction with Transition-Metal Single-Atom Molecular Catalysts
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Cobalt Single Atoms on Tetrapyridomacrocyclic Support for Efficient Peroxymonosulfate Activation
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Hydrogen Activation and Spillover on Anatase TiO 2 -Supported Ag Single-Atom Catalysts
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X-ray Spectroscopy of a Rare-Earth Molecular System Measured at the Single Atom Limit at Room Temperature
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Benchmarking a Molecular Flake Model on the Road to Programmable Graphene-Based Single-Atom Catalysts
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Controlling Hydrocarbon (De)Hydrogenation Pathways with Bifunctional PtCu Single-Atom Alloys
The conversions of surface-bound alkyl groups to alkanes and alkenes are important steps in many heterogeneously catalyzed reactions. On the one hand, while Pt is ubiquitous in industry because of its high activity toward C–H activation, many Pt-based catalysts tend to overbind reactive intermediates, which leads to deactivation by carbon deposition and coke formation. On the other hand, Cu binds intermediates more weakly than Pt, but activation barriers tend to be higher on Cu. We examine the reactivity of ethyl, the simplest alkyl group that can undergo hydrogenation and dehydrogenation via β-elimination, and show that isolated Pt atoms in Cu enable low-temperature hydrogenation of ethyl, unseen on Cu, while avoiding the decomposition pathways on pure Pt that lead to coking. Lastly, we confirm the predictions of our theoretical model and experimentally demonstrate that the selectivity of ethyl (de)hydrogenation can be controlled by changing the surface coverage of hydrogen.