Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (5): 964-972.DOI: 10.1016/S1872-2067(12)60585-3

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

CHEN Bohaoa,b,c, MA Yunshenga, DING Liangbinga, XU Lingshuna,b,c, WU Zongfanga,b,c, YUAN Qinga,b,c, HUANG Weixina,b,c   

  1. a Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, Anhui, China;
    b CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, Anhui, China;
    c Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, Anhui, China
  • Received:2013-01-05 Revised:2013-05-20 Online:2013-05-06 Published:2013-05-06
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21073172), the National Basic Research Program of China (973 Program, 2013CB933104, 2013CB933102, 2010CB923301), and the Fundamental Research Funds for the Central Universities.

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Abstract:

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.

Key words: Nitrogen oxide, Cu(111), Oxygen species, Adsorption, Temperature-programmed desorption, X-ray photoelectron spectroscopy