Measurement of the Adsorption Kinetics of Co and Co Co-Adsorbed with O2 on Cr(110)
Walters, Jennifer L.
Previous studies of the adsorption of CO on the catalytically active Cr(110) surface have found that the CO molecule dissociates upon adsorption at 300 K. One aspect of the CO adsorption process that has not been studied in detail is the temperature dependence of the dissociation and the influence of oxygen on the dissociation process. Therefore, we have performed temperature programmed desorption (TPD) and low energy electron diffraction (LEED) measurements of the adsorption of CO and CO co-adsorbed with oxygen on the Cr(110) surface. Deposition of CO was performed at 120 K on either the clean or oxygen dosed Cr(110) surface before performing the TPD measurements. For deposition below 0.5 Langmuir (L), no CO is detected with TPD, which indicates that all of the CO is dissociating and reacting with the Cr(110) surface. As the CO dose is increased, a broad peak centered at 300 K is first observed, followed by a second peak at 220 K. Oxygen co-adsorption suppresses the dissociation of the CO at low coverages.
Adsorption kinetics, Carbon monoxide, Cr(110), Surface science, Ultra high vacuum, Temperature programmed Desorption
Walters, J. L. (2010). <i>Measurement of the adsorption kinetics of Co and Co Co-adsorbed with O2 on Cr(110)</i> (Unpublished thesis). Texas State University-San Marcos, San Marcos, Texas.