Reaction of CH2 with adsorbed O on Ru(001) surface

SURFACE SCIENCE

卷:459

Article

Kis, A ; Kiss, J ; Solymosi, F

关键词: aldehydes;    oxygen;    photochemistry;    ruthenium;    thermal desorption spectroscopy;    ultraviolet photoelectron spectroscopy;    work function measurements;    X-ray photoelectron spectroscopy;   

DOI  :  10.1016/S0039-6028(00)00462-3

来源: Elsevier

【 摘 要 】

The reaction pathways of CH2 in the presence of coadsorbed oxygen atoms on Ru(001) surface were investigated by means of temperature-programmed desorption (TPD), photoelectron spectroscopy (XPS and UPS) and work function measurements, CH2 species were produced by thermal and photoinduced dissociation of CH2I2. Preadsorbed oxygen atoms markedly stabilized C-I bonds, shifted the desorption of CH2I2 to higher temperatures and reacted with CH2 formed to give formaldehyde above 200 K. Adsorbed formate was also detected in the temperature range of 300-450 K. The oxidation of surface species (CH2O, HCOO, CxHy) proceeded above 450 K, to produce CO, CO2, and H2O. Illumination of the (CH2I2+O) coadsorbed layer initiated the dissociation of CH2I2, and induced the reaction of CH2 with O slightly above 110 K. (C) 2000 Elsevier Science B.V. All rights reserved.

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