CO2 Activation and Methanol Synthesis on Novel Au/TiC and Cu/TiC Catalysts

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• 作者：Alba B. Vidal ; Leticia Feria ; Jaime Evans ; Yoshiro Takahashi ; Ping Liu ; Kenichi Nakamura ; Francesc Illas ; Jos茅 A. Rodriguez
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：August 16, 2012
• 年：2012
• 卷：3
• 期：16
• 页码：2275-2280
• 全文大小：340K
• 年卷期：v.3,no.16(August 16, 2012)
• ISSN：1948-7185

文摘

Small Cu and Au particles in contact with a TiC(001) surface undergo a charge polarization that makes them very active for CO₂ activation and the catalytic synthesis of methanol. The binding energy of CO₂ on these systems is in the range of 0.6 to 1.1 eV, much larger than those observed on surfaces or nanoparticles of Cu and Au. Thus, in spite of the poor CO₂ hydrogenation performance of Cu(111) and Au(111), the Cu/TiC(001) and Au/TiC(001) systems display a catalytic activity for methanol synthesis substantially higher than that of conventional Cu/ZnO catalysts. The turnover frequencies for methanol production on Cu/TiC(001) are 170鈥?00 times much larger than on Cu(111). The present study moves away from the typical approach of using metal/oxide catalysts for the synthesis of methanol via CO₂ hydrogenation. This work shows that metal carbides can be excellent supports for enhancing the ability of noble metals to bond and activate CO₂.

Keywords:

CO₂ activation; methanol synthesis; copper; gold; titanium carbide; catalysis; hydrogenation reactions