Special Materials Science & Engineering Seminar

Thursday, June 6, 2013 - 2:00pm - 3:00pm
Columbia University Morningside Campus S.W. Mudd, Room 214

Hyunjoo Lee
Department of Chemical and Biomolecular Engineering
Yonsei University, Seoul
Nanocatalyst Design by Modulating Shape and Composition
Heterogeneous catalysts have been widely applied in modern chemical
industry. In spite of their practical importance, fundamental
understanding and rational design of the heterogeneous catalysts has
been impeded because the structure of the catalyst is often hard to
control. We are trying to understand the chemical reactions occurred at
the surface of nanoparticle catalysts and design the catalysts to have
better performance of higher activity, selectivity, and stability.
First, we control the shape of platinum-group metal nanoparticles to
have specific facets, and tested them for electrocatalytic reactions or
various hydrogenation reactions. The unique surface structure
contributed to presenting higher activity and selectivity. The novel
approach preparing shaped nanoparticles directly overgrown on the
support with high surface area will be also introduced. Second,
controlling the interaction between catalytic metal components and
support materials can enhance activity and stability while minimizing
the amount of precious metal catalysts. We found that the mode of Pt
deposition on Au with different surface structure (e.g. Au(100) vs.
Au(111)) is distinct resulting in different activity. The amount of
deposited Pt on Au(111) surface was controlled and atomically dispersed
Pt catalyst was prepared. This catalyst presented unprecedentedly high
activity for electrocatalytic formic acid oxidation whereas the same
catalyst showed no activity for electrocatalytic methanol oxidation.
Third, other examples of nanocatalyst design for biomass conversion and
methane conversion will be also presented.       
Host: Prof. I.C. Noyan 

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