Measurement of the Adsorption Kinetics of CO and CO$_{2}$ on Cr(110)

POSTER

Abstract

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) studies of the adsorption of CO, CO with oxygen, and CO$_{2}$ 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 200 K. Oxygen coadsorption increases the rate at which the CO desorption is observed but does not result in CO$_{2}$ desorption. For comparison, TPD measurements have also been performed for adsorption of CO$_{2}$ at 120 K.

Authors

  • Jennifer Walters

  • Mikhail Zhernenkov

    Angelo State University Department of Physics, Department of Electrical and Computer Engineering, Texas Tech University, The University of Texas at San Antonio, Univeristy of Central Florida-College of Optics and Photonics, BAE Systems, University of Alberta Department of Physics, Istanbul University Department of Physics, Texas Tech University Department of Physics, Istanbul University, Beyazit, University of Alberta, Edmonton, UTD, TAMS at UNT, Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, TX 79968, College of Nanoscale Science and Engineering, University at Albany, Dept. of Physics, University of New Orleans, University of Texas at Arlington, Prairie View A\&M University, Chemistry, UTSA, Sciprint.org, Texas Tech University Department of Electrical and Computer Engineering, Texas State University, Punjab U, Dept. of Mechanical Engineering, University of Texas, Dept. of Physics, Texas State University, Department of Physics, University of Texas at Dallas, Richardson TX 75080, Department of Physics, Texas A\&M University, College Station, Texas 77843-4242, Department of Physics, University of California, San Diego, California 92093, Universidade Federal Fluminense, Volta Redonda, RJ, Brazil, Universidade de Sao Paulo, Sao Paulo, SP, Brazil, Department of Physics, Texas A\&M University, University of Colorado at Colorado Springs, Federal University of Rio Grande do Norte, University of Texas Arlington, Harvard-Smithsonian Center for Astrophysics, Max Plank Institute, Dresden, Germany, Education Consultant, APS, The University of Texas M. D. Anderson Cancer Center, Department of Physics, Texas A\&M University, College Station, TX 77843, LANSCE, Los Alamos National Laboratory

  • Christopher Cumby

  • Gabriel Arellano

  • Heike Geisler

  • Carl Ventrice

    Dept. of Physics, Texas State University, Texas State University - San Marcos