CFN Colloquium

"Single-Atom Alloy Catalysts: Born in a Vacuum, Tested in Reactors, and Understood In Silico"

Presented by E. Charles H. Sykes, Tufts University, Department of Chemistry

Thursday, May 5, 2022, 4:00 pm — Videoconference / Virtual Event (see link below)

In this talk I will discuss a new class of heterogenous catalysts called Single-Atom Alloys in which precious, reactive metals are utilized at the ultimate limit of efficiency.1-6 These catalysts were discovered by combining atomic-scale scanning probes with more traditional approaches to study surface-catalyzed chemical reactions. This research provided links between atomic-scale surface structure and reactivity which are key to understanding and ultimately controlling important catalytic processes. In collaboration with Maria Flytzani-Stephanopoulos these concepts derived from our surface science and theoretical calculations have been used to design Single-Atom Alloy nanoparticle catalysts that are shown to perform industrially relevant reactions at realistic reaction conditions. For example, alloying elements like platinum and palladium with cheaper, less reactive host metals like copper enables 1) dramatic cost savings in catalyst manufacture, 2) more selective hydrogenation and dehydrogenation reactions, 3) reduced susceptibility to CO poisoning, and 4) higher resistance to deactivation by coking. I go on to describe very recent theory work by collaborators Stamatakis (UCL) and Michaelides (Cambridge University) that predicts reactivity trends for a wide range of Single-Atom Alloy combinations for important reaction steps like H-H, C-H, N-H, O-H, and CO2 activation. Overall, I hope to highlight that this combined surface science, theoretical, and catalyst synthesis and testing approach provides a new and somewhat general method for the a priori design of new heterogeneous catalysts.

Hosted by: Qin Wu

Videoconference Instructions

Please click the link below to join the webinar: Passcode: 349211 Or iPhone one-tap : US: +16692545252,,1610998573#,,,,,,0#,,349211# or +16468287666,,1610998573#,,,,,,0#,,349211# Or Telephone: Dial(for higher quality, dial a number based on your current location): US: +1 669 254 5252 or +1 646 828 7666 Webinar ID: 161 099 8573 Passcode: 349211 International numbers available: Or an H.323/SIP room system: H.323: (US West) or (US East) Meeting ID: 161 099 8573 Passcode: 349211 SIP: Passcode: 349211

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