AVS 63rd International Symposium & Exhibition
    Surface Science Monday Sessions
       Session SS+AS+HC-MoM

Paper SS+AS+HC-MoM10
Interaction of BaO with H2O, CO2 and NO2 Studied with APXPS and NEXAFS

Monday, November 7, 2016, 11:20 am, Room 104E

Session: Mechanistic Insights on Surface Reactions in Catalysis and at Novel Interfaces
Presenter: Osman Karslioglu, Lawrence Berkeley National Laboratory
Authors: O. Karslioglu, Lawrence Berkeley National Laboratory
I. Zegkinoglou, Lawrence Berkeley National Laboratory
L. Trotochaud, Lawrence Berkeley National Laboratory
H. Bluhm, Lawrence Berkeley National Laboratory
Correspondent: Click to Email
Barium is a constituent of several technologically important materials such as NOx storage and reduction (NSR) catalysts in automobiles, getters for UHV applications, perovskite catalysts for electrochemical reactions and high-temperature superconductors. Interaction of barium compounds with simple molecules such as H2O, CO2 and NO2 is thus of practical importance. We studied the interaction of in-situ prepared BaO with H2O, CO2 and NO2 as a function of temperature and pressure using ambient pressure X-ray photoelectron spectroscopy (APXPS) and near-edge X-ray absorption fine structure (NEXAFS). Using in-situ preparation proved essential for preparing clean BaO, as the compound is extremely reactive even with minute amounts of H2O and CO2. We report the first experimental O K-edge X-ray absorption spectrum of clean BaO, for which the published spectra in the literature are more consistent with BaCO3.