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Tandem Catalysis for CO2 Hydrogenation to C2–C4 Hydrocarbons

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journal contribution
posted on 11.05.2017 by Chenlu Xie, Chen Chen, Yi Yu, Ji Su, Yifan Li, Gabor A. Somorjai, Peidong Yang
Conversion of carbon dioxide to C2–C4 hydrocarbons is a major pursuit in clean energy research. Despite tremendous efforts, the lack of well-defined catalysts in which the spatial arrangement of interfaces is precisely controlled hinders the development of more efficient catalysts and in-depth understanding of reaction mechanisms. Herein, we utilized the strategy of tandem catalysis to develop a well-defined nanostructured catalyst CeO2–Pt@mSiO2–Co for converting CO2 to C2–C4 hydrocarbons using two metal-oxide interfaces. C2–C4 hydrocarbons are found to be produced with high (60%) selectivity, which is speculated to be the result of the two-step tandem process uniquely allowed by this catalyst. Namely, the Pt/CeO2 interface converts CO2 and H2 to CO, and on the neighboring Co/mSiO2 interface yields C2–C4 hydrocarbons through a subsequent Fischer–Tropsch process. In addition, the catalysts show no obvious deactivation over 40 h. The successful production of C2–C4 hydrocarbons via a tandem process on a rationally designed, structurally well-defined catalyst demonstrates the power of sophisticated structure control in designing nanostructured catalysts for multiple-step chemical conversions.