Water-Induced Adsorption of Carbon Monoxide and Oxygen on the Gold Dimer Cation

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• 作者：Tomonori Ito ; G. Naresh Patwari ; Masashi Arakawa ; Akira Terasaki
• 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：8293-8297
• 全文大小：247K
• ISSN：1520-5215

文摘

It is demonstrated, using tandem mass spectrometry and ion trap, that preadsorption of a H₂O molecule on the gold dimer cation, Au₂⁺, enhances adsorption of CO and O₂ molecules, which is otherwise inert toward these molecules. The rate of adsorption of CO on Au₂(H₂O)⁺ was found to be higher by 2 orders of magnitude relative to bare Au₂⁺. The enhancement of the CO adsorption rate is due to the presence of a reaction channel, which cleaves the Au鈥揂u bond, leading to the formation of Au(H₂O)(CO)⁺. Such an observation can be attributed to weakening of the Au鈥揂u bond upon adsorption of a water molecule. Further, it was also observed that preadsorption of H₂O leads to dramatic enhancement of O₂ adsorption on the Au₂⁺ ion, which can be attributed to the changes in the electron density following water adsorption.