Covestro Lecture

Oxide-metal Interfaces as Active Sites for Acid-base Catalysis: Oxidation State of Nanocatalyst Change with Decreasing Size, Conversion of Heterogeneous to Homogeneous Catalysis, Hybrid Systems

Speaker(s): 
Gábor A. Somorjai
Dates: 
Friday, May 6, 2016 - 9:30am to 10:30am

When metal nanoparticles are placed on different mezoporous or microporous oxide supports the catalytic turnover rates and selectivities markedly change.  The charge flow between the metal and the oxide ionizes the adsorbed molecules at the oxide-metal interfaces and alters the catalytic chemistry (acid-base catalysis). 

The oxidation state of metal nanoparticles becomes less metallic and assume higher oxidation states with decreasing size.  The...

Metal Nanocatalysts, Their Synthesis and Size Dependent Covalent Bond Catalysis: Instrumentation for Characterization under Reaction Conditions

Speaker(s): 
Gábor A. Somorjai
Dates: 
Thursday, May 5, 2016 - 5:00pm to 7:00pm

Colloidal chemistry is used to control the size, shape and composition of metal nanoparticles usually in the 1-10 nm range.  In-situ methods are used to characterize the size, structure (electronic and atomic), bonding, composition and oxidation states under reaction conditions.  These methods include sum frequency generation nonlinear optical spectroscopy (SFG), ambient pressure X-ray photoelectron spectroscopy (APXPS) and high pressure scanning tunneling...