XPS and TPD study of NO interaction with Cu(111): Role of different oxygen species

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• 作者：Bohao CHEN^a ; ^b ; ^c ; Yunsheng MA^a ; ^{ysma@ustc.edu.cn} ; Liangbing DING^a ; Lingshun XU^a ; ^b ; ^c ; Zongfang WU^a ; ^b ; ^c ; Qing YUAN^a ; ^b ; ^c ; Weixin HUANG^a ; ^b ; ^c ; ^{huangwx@ustc.edu.cn}
• 关键词：Nitrogen oxide ; Cu(111) ; Oxygen species ; Adsorption ; Temperature-programmed desorption ; X-ray photoelectron spectroscopy
• 刊名：Chinese Journal of Catalysis
• 出版年：2013
• 出版时间：May, 2013
• 年：2013
• 卷：34
• 期：5
• 页码：964-972
• 全文大小：1017 K

文摘

The adsorption and reaction of NO on clean and O-precovered Cu(111) has been studied using X-ray photoelectron spectroscopy and temperature-programmed desorption spectroscopy. By varying NO exposure and annealing temperature, two different types of chemisorbed oxygen species, with O 1s binding energies (BE) of 531.0 (O₅₃₁) and 529.7 eV (O₅₂₉), were prepared on Cu(111). In the presence of O₅₃₁ species, the relative occupation of different NO adsorption states was largely affected, and most of the adsorbed NO(a) underwent dissociative desorption, releasing N₂O and N₂ upon heating. In contrast, in the presence of O₅₂₉ species, the dissociative desorption of NO(a) was largely suppressed. Furthermore, the O₅₂₉ species show a more significant blocking effect on NO adsorption than the chemisorbed O₅₃₁ species. Our results reveal that the effect of precovered oxygen species on the adsorption and reaction of NO on Cu(111) is closely related to the type of oxygen species and oxygen coverage.