272866 Photocatalytic Reduction of CO2 to Fuels by Brookite-Containing Mixed-Phase TiO2 Nanocrystals

Monday, October 29, 2012: 1:10 PM
321 (Convention Center )
Huilei Zhao1, Lianjun Liu1, Jean M. Andino2 and Ying Li1, (1)University of Wisconsin-Milwaukee, Milwaukee, WI, (2)Chemical Engineering, Arizona State University, Tempe, AZ

Photocatalytic reduction of CO2 to fuels (CO, methane, methanol, etc) by sunlight is potentially a promising sustainable energy technology that not only reduces greenhouse gas emissions but also produces renewable fuels. TiO2 has been widely used as a photocatalyst due to its low cost, high stability, and non-toxicity.  TiO2 naturally occurs as three polymorphs: anatase, brookite and rutile. Among them, only TiO2 anatase, rutile or anatase-rutile mixed phase (P25) have been studied for CO2 photoreduction. Brookite phase is much less studied as a photocatalyst and has not been studied for CO2 photoreduction so far.  In this work, brookite containing mixed-phase (e.g., anatase-brookite, anatase-brookite-rutile) TiO2 nanocrystals have been synthesized through a hydrothermal method with a good control in brookite phase fraction. The catalysts are well characterized by UV-vis, XRD, SEM, TEM, BET, and FTIR analysis. The experiments of photocatalytic CO2 reduction with water vapor using the prepared catalysts are conducted under simulated sunlight irradiation. CO and CH4 are the major reduction products measured by a gas chromatograph (GC) equipped with thermal conductivity detector (TCD) and flame ionization detector (FID). The interfacial charge transfer between the different phase nanocrystals and CO2 reduction mechanisms are also investigated in this study.

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See more of this Session: Catalysis for CO2 Conversion II
See more of this Group/Topical: Catalysis and Reaction Engineering Division