CFN Colloquium

"The role of chemical and steric environment of active sites on catalytic activity"

Presented by Prof. Dr. Johannes A. Lercher, Department of Chemistry Technische Universität München, Garching, Germany / Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA, Germany

Monday, November 7, 2016, 4:00 pm — CFN Bldg 735, Seminar Room, 2nd Floor

Understanding the elementary steps in acid-base and metal catalyzed organic transformations is a key for sustainable chemical conversions. Solid acids and bases with nano-pores such as zeolites act as solid Brønsted and Lewis acids, widely used as catalysts with well-defined acid-base sites and a well-defined reaction space around the sites. Within the pores of molecular sieves reacting molecules are constrained in a reaction space, which can be subtly adjusted via direct synthesis, as well as via the addition of cations, oxidic clusters or organic fragments. The impact of such changes on mono- and bimolecular reactions such as elimination reactions of alcohols, cracking and alkylation of hydrocarbons are discussed for gas and liquid phase reactions. Experimental methods to define the state of the reacting molecules combined with detailed kinetic analysis and theory will be used to explain the principal contributions of the interactions and the confinement to determine reaction rates. It will be discussed how reaction rates and pathways can be tailored using the space available for a transition state and the chemical constituents around the active site.

Hosted by: Mircea Cotlet

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