Home > Seminars > Casey O'Brien: Rational Catalyst Design from Model Studies with a Molecular-Beam/Surface-Spectroscopy Apparatus

Casey O'Brien: Rational Catalyst Design from Model Studies with a Molecular-Beam/Surface-Spectroscopy Apparatus

Start:

3/2/2017 at 12:30PM

End:

3/2/2017 at 1:30PM

Location:

131 DeBartolo Hall

Host:

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Edward Maginn

Edward Maginn

VIEW FULL PROFILE Email: ed@nd.edu
Phone: 574-631-5687
Website: http://www.nd.edu/~ed/
Office: 182A Fitzpatrick Hall

Affiliations

Department of Chemical and Biomolecular Engineering Dorini Family Professor of Energy Studies and Department Chair
College of Engineering Dorini Family Professor of Energy Studies and Chair of the Department of Chemical and Biomolecular Engineering
The research in our group focuses on developing a fundamental understanding of the link between the physical properties of materials and their chemical constitution. Much of our work is devoted to applications related to energy and the environment. The main tool we use is molecular simulation. In ...
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Selective hydrogenation of α,β-unsaturated aldehydes, a class of multi-functional compounds that have conjugated C=C and C=O bonds, is a critical step in the production of many fine chemicals and pharmaceuticals.  The unsaturated alcohol produced from selective hydrogenation of the C=O bond is the desired product, but thermodynamics strongly favors hydrogenation of the C=C bond.  Therefore, selective hydrogenation of α,β-unsaturated aldehydes is not only an industrially important reaction, it is also a fundamentally interesting problem: how does the structure of a heterogeneous catalyst influence the selectivity, and how can a catalyst be rationally designed with high selectivity towards unsaturated alcohol production?

In this talk, I will show that the selectivity in hydrogenation of α,β-unsaturated aldehydes can be controlled by manipulating the structure of Pd model catalysts—both single crystal Pd(111) and Pd nanoparticles dispersed on planar oxide supports.  Near 100% selectivity towards the desired product unsaturated alcohol is possible, but only after modification of the catalyst surface by organic deposits during the initial stages of the reaction.  By applying a combination of multi-molecular beam techniques and in-situ infrared reflection absorption spectroscopy, the chemical nature of the organic deposit that enhances selectivity is identified.  Using structure-selectivity relationships obtained from these model studies under well-defined ultra-high vacuum conditions, several promising strategies for designing practical catalysts with high selectivity towards C=O hydrogenation in α,β-unsaturated aldehydes are proposed.

Seminar Speaker:

Casey O'Brien

Casey O'Brien

Army Research Laboratory

Casey O’Brien received his B.S. in Chemical Engineering from the University of Colorado at Boulder in 2006 and his Ph.D. in Chemical Engineering from Carnegie Mellon University in 2011.  Thereafter, he was a postdoctoral fellow in the Chemical Physics Department of the Fritz Haber Institute of the Max Planck Society.  He joined the Sensors and Electron Devices Directorate of the U.S. Army Research Laboratory in 2014.  His research is focused on understanding how the structure and composition of catalytic surfaces—including heterogeneous catalysts and catalytic membranes—influences the surface reaction mechanisms in order to rationally design surfaces with high activity, selectivity, and durability.  He has recently developed a novel spectroscopic tool and technique, operando membrane spectroscopy, which enables the spectroscopic characterization of membranes under realistic permeation conditions with simultaneous measurement of trans-membrane gas permeation rates.  

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