TY - JOUR
T1 - Dispersion and site-blocking effect of molybdenum oxide for CO chemisorption on the Pt(1 1 0) substrate
AU - Jiang, Zhiquan
AU - Huang, Weixin
AU - Zhao, Hong
AU - Zhang, Zhen
AU - Tan, Dali
AU - Bao, Xinhe
PY - 2007/5/1
Y1 - 2007/5/1
N2 - The Pt(1 1 0) model surfaces modified by the metallic molybdenum and by the MoOx (molybdenum oxide species) were fabricated via thermal decomposition of Mo(CO)6 and subsequent oxidation on a clean Pt(1 1 0) substrate, by means of Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS), as well as high-resolution electron-energy-loss spectroscopy (HREELS). CO chemisorption on these model surfaces was investigated using thermal desorption spectroscopy (TDS) and HREELS. The presence of the metallic molybdenum and MoOx species suppresses CO chemisorption on the Pt(1 1 0) substrate, indicating a physically site-blocking effect. The electron-deficiency of the Pt(1 1 0), due to the modification of metallic molybdenum, causes the low-temperature peak of CO desorption to shift downward in temperature by ∼30 K. The interaction between the MoOx and the underlying Pt(1 1 0) substrate has no influence on CO desorption temperature.
AB - The Pt(1 1 0) model surfaces modified by the metallic molybdenum and by the MoOx (molybdenum oxide species) were fabricated via thermal decomposition of Mo(CO)6 and subsequent oxidation on a clean Pt(1 1 0) substrate, by means of Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS), as well as high-resolution electron-energy-loss spectroscopy (HREELS). CO chemisorption on these model surfaces was investigated using thermal desorption spectroscopy (TDS) and HREELS. The presence of the metallic molybdenum and MoOx species suppresses CO chemisorption on the Pt(1 1 0) substrate, indicating a physically site-blocking effect. The electron-deficiency of the Pt(1 1 0), due to the modification of metallic molybdenum, causes the low-temperature peak of CO desorption to shift downward in temperature by ∼30 K. The interaction between the MoOx and the underlying Pt(1 1 0) substrate has no influence on CO desorption temperature.
KW - High-resolution electron-energy-loss spectroscopy
KW - Molybdenum
KW - Pt(1 1 0)
KW - Thermal desorption spectroscopy
KW - X-ray photoelectron spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=33947583231&partnerID=8YFLogxK
U2 - 10.1016/j.molcata.2006.12.024
DO - 10.1016/j.molcata.2006.12.024
M3 - 文章
AN - SCOPUS:33947583231
SN - 1381-1169
VL - 268
SP - 213
EP - 220
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-2
ER -