Adsorption and Reaction of Methanol on Anatase TiO$_{\mathrm{2}}$(101)

ORAL

Abstract

Anatase TiO$_{\mathrm{2}}$ is used extensively in a wide range of heterogeneous and photocatalytic processes. As such, understanding the interaction of prototypical organic compound methanol with anatase is of high importance. In this study, we employ scanning tunneling microscopy and temperature programmed desorption to study the adsorption and reaction of methanol on anatase TiO$_{\mathrm{2}}$(101). We find that adsorption of molecular methanol at 80 K leads to the formation of chains along the titania rows. These chains are metastable and fall apart upon annealing due to the repulsion of neighboring molecules. Further, we find that methanol deprotonates to produce neighboring methoxy and hydroxyl groups following the annealing of high coverages to room temperature. The coverage of methoxy and hydroxyl groups can be increased with repeated adsorption and annealing cycles, and the annealing above room temperature leads to the recombinative desorption of methanol.

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Authors

  • Arjun Dahal

    Department of Physics, University of South Alabama, Mobile AL

  • Emmanuel Sarpong

    Georgia State University, University of Alabama at Birmingham, American Association of Physics Teachers, Bradley University, Michigan State University, University of St. Thomas, Kansas State University, Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, University of Delhi, University of Mississippi, Vanderbilt University, Universidad de los Andes (Colombia), President of UNCW SPS Chapter, Duke University, NC Central University, Davidson College, Beijing Normal University, University of California, Los Angeles, University of Tennessee, Chattanooga, University of Kentucky, Syracuse University, Clemson University, Department of Physics & Astronomy, Florida International University, Oak Ridge National Lab, Indiana University, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Bowie State University, MD, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Arizona State University, University of California, Davis, North Carolina State University, Virginia Commonwealth University, North Carolina A&T State University, UNC Charlotte

  • Emmanuel Sarpong

    Georgia State University, University of Alabama at Birmingham, American Association of Physics Teachers, Bradley University, Michigan State University, University of St. Thomas, Kansas State University, Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, University of Delhi, University of Mississippi, Vanderbilt University, Universidad de los Andes (Colombia), President of UNCW SPS Chapter, Duke University, NC Central University, Davidson College, Beijing Normal University, University of California, Los Angeles, University of Tennessee, Chattanooga, University of Kentucky, Syracuse University, Clemson University, Department of Physics & Astronomy, Florida International University, Oak Ridge National Lab, Indiana University, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Bowie State University, MD, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Arizona State University, University of California, Davis, North Carolina State University, Virginia Commonwealth University, North Carolina A&T State University, UNC Charlotte

  • Emmanuel Sarpong

    Georgia State University, University of Alabama at Birmingham, American Association of Physics Teachers, Bradley University, Michigan State University, University of St. Thomas, Kansas State University, Physical and Computational Sciences Directorate and Institute for Integrated Catalysis, Pacific Northwest National Laboratory, University of Delhi, University of Mississippi, Vanderbilt University, Universidad de los Andes (Colombia), President of UNCW SPS Chapter, Duke University, NC Central University, Davidson College, Beijing Normal University, University of California, Los Angeles, University of Tennessee, Chattanooga, University of Kentucky, Syracuse University, Clemson University, Department of Physics & Astronomy, Florida International University, Oak Ridge National Lab, Indiana University, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), Bowie State University, MD, Oak Ridge National Laboratory, University of Tennessee, Knoxville, Arizona State University, University of California, Davis, North Carolina State University, Virginia Commonwealth University, North Carolina A&T State University, UNC Charlotte