(461c) Polymer-Nanocrystal Composites As Tailorable CO2 Hydrogenation Catalysts

Authors: 
Riscoe, A., Stanford University
Willis, J., Stanford University
Cargnello, M., Stanford University

The future of humankind is tied to our collective use of
energy. Hydrocarbons are a proven energy vector and account for the bulk of our
energy infrastructure and feedstocks to the chemical industry.  Combustion of
fossil based hydrocarbons is unsustainable given finite reserves and the
concomitant release of greenhouse gases.  Hydrogenation of waste CO2
back in to useful fuels and feedstocks provides a pathway to use fossil
resources in a sustainable way. The emerging technologies of photo and
electrochemical hydrogen generation can provide the hydrogen needed for CO2
hydrogenation renewably.  However, a main issue is still in finding CO2
hydrogenation catalysts that work at low temperature and that are selective
towards desirable compounds such as methanol.

In this study, we introduce a framework with which an
effective CO2 hydrogenation catalyst may be designed. Microporous
polymers provide a tunable chemical environment into which monodisperse
Palladium nanocrystal catalysts are incorporated.  The synergy of the confinement
effect of these frameworks with well-defined metal nanoparticles affording
highly active hydrogenation sites provides a platform for catalyst study and
optimization under conditions outside the range of standard inorganic supports.
 Combining gas sorption and catalytic data provides insights into the potential
that organic supports have for carbon dioxide hydrogenation.