Catalytic Oxidation of Methanol to Formaldehyde by Mass-Selected Vanadium Oxide Clusters Supported on a TiO2(110) Surface

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• 作者：Scott P. Price ; Xiao Tong ; Claron Ridge ; Hunter L. Neilson ; Joshua W. Buffon ; Jeremy Robins ; Horia Metiu ; Michael T. Bowers ; Steven K. Buratto
• 刊名：Journal of Physical Chemistry A
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：118
• 期：37
• 页码：8309-8313
• 全文大小：239K
• ISSN：1520-5215

文摘

We report the results of a systematic study of the catalytic activity of mass-selected vanadium oxide clusters deposited on rutile TiO₂ surfaces under ultrahigh vacuum (UHV) conditions. Our results show that supported V, VO, and VO₂ clusters are not catalytically active for the oxidative dehydrogenation of methanol to formaldehyde but can be made catalytically active by postoxidation. In addition, we found that the postoxidized VO/TiO₂ produces the most formaldehyde. Scanning tunneling microscopy (STM) imaging of the postoxidized VO/TiO₂ reveals isolated clusters with height and width indicative of VO₃ bound to the TiO₂ surface. Our results are consistent with previous density functional theory (DFT) calculations that predict that VO₃ will be produced by postoxidation of VO and that VO₃/TiO₂ is an active catalyst.