Hydrogenation of CO2 to Methanol: Importance of Metal鈥揙xide and Metal鈥揅arbide Interfaces in the Activation of CO2

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• 作者：Jos茅 A. Rodriguez ; Ping Liu ; Dario J. Stacchiola ; Sanjaya D. Senanayake ; Michael G. White ; Jingguang G. Chen
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：November 6, 2015
• 年：2015
• 卷：5
• 期：11
• 页码：6696-6706
• 全文大小：820K
• ISSN：2155-5435

文摘

The high thermochemical stability of CO₂ makes it very difficult to achieve the catalytic conversion of the molecule into alcohols or other hydrocarbon compounds, which can be used as fuels or the starting point for the generation of fine chemicals. Pure metals and bimetallic systems used for the CO₂ 鈫?CH₃OH conversion usually bind CO₂ too weakly and, thus, show low catalytic activity. Here, we discuss a series of recent studies that illustrate the advantages of metal鈥搊xide and metal鈥揷arbide interfaces when aiming at the conversion of CO₂ into methanol. CeO_x/Cu(111), Cu/CeO_x/TiO₂(110), and Au/CeO_x/TiO₂(110) exhibit an activity for the CO₂ 鈫?CH₃OH conversion that is 2鈥? orders of magnitude higher than that of a benchmark Cu(111) catalyst. In the Cu鈥揷eria and Au鈥揷eria interfaces, the multifunctional combination of metal and oxide centers leads to complementary chemical properties that open active reaction pathways for methanol synthesis. Efficient catalysts are also generated after depositing Cu and Au on TiC(001). In these cases, strong metal鈥搒upport interactions modify the electronic properties of the admetals and make them active for the binding of CO₂ and its subsequent transformation into CH₃OH at the metal鈥揷arbide interfaces.