【学术视频】印第安纳大学Steven L. Tait教授：Single-site Catalysts by Metal...

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图 | Steven L. Tait

题   目：Single-site Catalysts by Metal-ligand Complexation at Surfaces: From Model Systems in Vacuum to High-pressure Catalysis on Oxide Supports

报告人：Steven L. Tait

单   位：Indiana University

时   间：2019-05-31

地   点：中国科学技术大学

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报告摘要

A grand challenge in heterogeneous catalysis is to achieve high levels of selectivity by controlling the chemical uniformity of metal catalyst sites at surfaces. Our group is working to develop a better understanding of fundamental aspects of self-assembly and organic film growth at surfaces and to apply principles of on-surface metal-organic redox assembly to develop a new approach to this problem. Metal-organic coordination networks at surfaces hold promise for selective chemical function, but there is a limited understanding of the chemical reactivity of these systems. We tested chemical activity of vanadium single-site complexes that are stabilized by tetrazine-based ligands. We demonstrate activity toward dioxygen activation and a high degree of selectivity compared to vanadium nanoparticles. Reaction with O₂ causes an increase in V oxidation state from VII to VIV, resulting in a single strongly bonded V-oxo product and spillover of O to the Au surface. The metal centers are stabilized in extended, ordered metal-organic complexes that self-assemble through an on-surface redox process on the Au(100) surface and are characterized by X-ray photoelectron spectroscopy, scanning tunneling microscopy, high-resolution electron energy loss spectroscopy, and density functional theory. New results extend these chemical studies to more complex systems that include bimetallic sites and redox isomer systems, which will also be highlighted in this presentation.

个人简介

Dr. Steven L. Tait is an associate Professor of Chemistry at Indiana University Bloomington. He obtained a BS degree in Honors Physics and University Honors from Brigham Young University in 2000. He went on to graduate studies at the University of Washington, where his doctoral studies were co-supervised by Charlie Campbell in Chemistry and Sam Fain in Physics. A significant portion of his doctoral work was done in the laboratories of Bruce Kay at Pacific Northwest National Laboratory in eastern Washington State through a graduate fellowship program in Nanoscience co-sponsored by UW and PNNL. His doctoral work explored the desorption kinetics of small alkanes from solid surfaces, methane dissociation on Pd nanoparticles and the growth and sintering kinetics of Pd nanoparticles on aluminum oxide. He completed his PhD in 2005 and moved to Stuttgart, Germany for postdoctoral work in the department of Prof. Klaus Kern at the Max Planck Institute for Solid State Research. There he studied the self-organization of supramolecular nanometer-scale structures at surfaces, especially systems formed by metal-organic coordination. Those studies were sponsored by fellowship awards from the Alexander von Humboldt Foundation and the Max Planck Society. 

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