Debye lunch lecture - dr. Jessi van der Hoeven (MCC)


Title: Raspberry Colloid Templated Catalysts: from Material Design to Catalytic Performance

Abstract: Designing active, selective and stable nanoparticle catalystsis a key challenge in the field of heterogeneous catalysis. Raspberry-Colloid-Templated (RCT) catalysts are an emerging class of materials developed in the Aizenberg lab at Harvard University that show an unprecedented level of sinter-resistance and exhibit high catalytic activity in a wide range of selective oxidation and hydrogenation reactions. In the first part of my lecture I will discuss the material characteristics underlying the nanoparticle stability and accessibility in these RCT catalysts using theoretical modeling, quantitative 3D electron microscopy and epitaxial overgrowth [1]. In the second part of the lecture I will focus on the catalytic aspects of RCTs containing dilute Pd-in-Au alloy nanoparticles [2]. In particular I will discuss how hydrogen dissociates on these bimetallic nanoparticle surfaces, which is a key step in a wide range of hydrogenation reactions. By combining experiment and density functional theory calculations we demonstrate the strong impact of the Pd ensemble size on the hydrogen dissociation, migration and recombination kinetics and energetics. The material science and catalysis concepts discussed in my lecture are valuable in guiding the structural design of stable and active catalytic materials through the nanoparticle-support interface and the nanoparticle surface composition.

[1] J.E.S. van der Hoeven, S. Krämer, S. Dussi, T. Shirman, K.-C. K. Park, C.H. Rycroft, D.C. Bell, C.M. Friend, J. Aizenberg, Advanced Functional Materials, 2021, 2106876

[2] J.E.S. van der Hoeven, H.T. Ngan, A. Taylor, N.M. Eagan, J. Aizenberg, P. Sautet, R.J. Madix and C.M. Friend, ACS Catalysis, 2021, 11, 12, 6971–6981


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