TY - JOUR
T1 - Adsorption of oxygen and oxidation of CO on the ruthenium (001) surface
AU - Madey, Theodore E.
AU - Albert Engelhardt, H.
AU - Menzel, Dietrich
N1 - Funding Information:
The authors acknowledge with pleasure valuable discussions with Dr. John T. Yates, Jr., Dr. R.P. Merrill, and Dr. J.T. Grant. This work has been supported in part by the Deutsche Forschungsgemeinschaft.
PY - 1975/3/2
Y1 - 1975/3/2
N2 - The adsorption of oxygen on the ruthenium (001) surface has been studied using a combination of techniques: LEED/Auger, Kelvin probe contact potential changes, and flash desorption mass spectrometry. Oxygen is rapidly adsorbed at 300 K, forming an ordered LEED structure having apparent (2 × 2) symmetry. Two binding states of oxygen are inferred from the abrupt change in surface work function as a function of oxygen coverage. LEED intensity measurements indicate that the oxygen layer undergoes an order-disorder transition at temperatures several hundred degrees below the onset of desorption. The order-disorder transition temperature is a function of the oxygen coverage, consistent with two binding states. A model involving the adsorption of atomic oxygen at θ < 0.5 and the formation of complexes with higher oxygen content at θ > 0.5 is proposed. The oxidation of CO to form CO2 was found to have the maximum rate of production at a ruthenium temperature of 950 K.
AB - The adsorption of oxygen on the ruthenium (001) surface has been studied using a combination of techniques: LEED/Auger, Kelvin probe contact potential changes, and flash desorption mass spectrometry. Oxygen is rapidly adsorbed at 300 K, forming an ordered LEED structure having apparent (2 × 2) symmetry. Two binding states of oxygen are inferred from the abrupt change in surface work function as a function of oxygen coverage. LEED intensity measurements indicate that the oxygen layer undergoes an order-disorder transition at temperatures several hundred degrees below the onset of desorption. The order-disorder transition temperature is a function of the oxygen coverage, consistent with two binding states. A model involving the adsorption of atomic oxygen at θ < 0.5 and the formation of complexes with higher oxygen content at θ > 0.5 is proposed. The oxidation of CO to form CO2 was found to have the maximum rate of production at a ruthenium temperature of 950 K.
UR - http://www.scopus.com/inward/record.url?scp=0001091676&partnerID=8YFLogxK
U2 - 10.1016/0039-6028(75)90409-4
DO - 10.1016/0039-6028(75)90409-4
M3 - Article
AN - SCOPUS:0001091676
SN - 0039-6028
VL - 48
SP - 304
EP - 328
JO - Surface Science
JF - Surface Science
IS - 2
ER -