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Near Ambient Pressure Adsorption of Nickel Carbonyl Contaminated CO on Cu(111) Surface
Rui Wang1,2, Ding Ding1, Wei Wei1, Yi Cui*1
1.Vacuum Interconnected Worksation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science, Suzhou 215123, China;2.Nano Science and Technology Institute, University of Science and Technology of China, Hefei 230026, China
Abstract:
Formation of volatile nickel carbonyls with CO in catalytic reaction is one of the mechanisms of catalyst deactivation. CO is one of the most popular probe molecules to study the surface properties in model catalysis. Under ultra-high vacuum (UHV) conditions, the problem of nickel carbonyl impurity almost does not exist in the case that a high purity of CO is used directly. While in the near ambient pressure (NAP) range, nickel carbonyl is easily found on the surface by passing through the Ni containing tubes. Here, the NAP techniques such as NAP-X-ray photoelectron spectroscopy and NAP-scanning tunneling microscopy are used to study the adsorption of nickel carbonyl contaminated CO gas on Cu(111) surface in UHV and NAP conditions. By controlling the pressure of contaminated CO, the Ni-Cu bimetallic catalyst can form on Cu(111) surface. Furthermore, we investigate the process of CO adsorption and dissociation on the formed Ni-Cu bi-metal surface, and several high-pressure phases of CO structures are reported. This work contributes to understanding the interaction of nickel carbonyl with Cu(111) at room temperature, and reminds the consideration of CO molecules contaminated by nickel carbonyl especially in the NAP range study.
Key words:  Nickel carbonyl, Carbon monoxide, Cu(111), Near ambient pressure X-ray photoelectron spectroscopy, Near ambient pressure scanning tunneling microscopy
FundProject:
被羰基镍污染的CO气体在Cu(111)表面的近常压吸附研究
王 睿1,2, 丁 丁1, 魏 伟1, 崔 义*1
1.中国科学院苏州纳米技术与纳米仿生研究所,纳米真空互联实验站,苏州 215123;2.中国科学技术大学纳米科学技术学院,合肥 230026
摘要:
本文利用近常压X射线光电子能谱和近常压扫描隧道显微镜研究了在超高真空(UHV)和近常压条件下,被羰基镍污染的CO气体在Cu(111)表面的吸附过程. 通过控制被污染CO的气体压力,可以在Cu(111)表面上形成Ni-Cu双金属催化剂. 此外,本文探索了CO在所形成的Ni-Cu双金属表面上的吸附和解离过程,并报道了几种CO的高压吸附相结构.
关键词:  羰基镍,一氧化碳,Cu(111),近常压X射线光电子能谱,近常压扫描隧道显微镜
DOI:10.1063/1674-0068/cjcp1904066
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