277314 Quantum Dynamical Modeling of CO2 Reduction Using Heterogenous Photocatalysis

Monday, October 29, 2012: 2:10 PM
318 (Convention Center )
Chris Singer and Cynthia S. Lo, Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO

Quantum dynamical methods may be employed to determine rates of reaction and efficiencies in heterogenous (photo)catalytic systems. Such simulations are also capable of giving state-specific product information, which can be coupled and compared with experimental results.  Potential energy surfaces were developed for CO2 and its anion in the gas phase as well as adsorbed to ZnO and TiO2 surfaces. These potential energy surfaces were identified according to the electronic state of the system. Quantum dynamical photodissociation simulations, following the time-dependent wavepacket approach, were then performed on COand its anionic counterpart to determine potential pathways towards CO2 reduction to form CO and O. Photodissociation products and rates may thus be determined as a function of initial rovibrational states, electronic states, and wavelength of incident light.  Ultimately, these dynamical studies assist us in finding photodissocation pathways that accurately account for the photocatalytic environment, so that we may guide experimental efforts to properly tailor catalyst design and reactor conditions to achieve efficient CO2 reduction to form chemicals and fuels.

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See more of this Session: Computational Catalysis I
See more of this Group/Topical: Catalysis and Reaction Engineering Division