Attenuated Total Reflection Fourier Transform Infrared Spectroscopic Investigation of CO Adsorption on Hydrated Ru/Al2O3
| Autor: | Kathryn A. Layman, Diana Gottschalk, Erin A. Hinson, Adam S. Baird, Katherine M. Kross, Neil Wood |
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| Rok vydání: | 2007 |
| Předmět: |
Thermal desorption spectroscopy
Chemistry Infrared Analytical chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Absorbance symbols.namesake General Energy Adsorption Fourier transform Desorption Attenuated total reflection symbols Molecule Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 111:14207-14214 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp0733421 |
| Popis: | The adsorption of CO on hydrated 5 wt % Ru/Al2O3 produced νCO absorbance features at ∼2048, 1992, and 1924 cm-1 that are red-shifted by 50−116 cm-1 from those seen in the absence of water (2020−2040, 2080, and 2140 cm-1). This red-shift most likely arises from dipole−dipole interaction between coadsorbed CO and water molecules since (1) the exact frequency of the νCO absorbance feature depends upon the amount of coadsorbed water and (2) the presence of flowing liquid water further red-shifts the frequencies. These νCO absorbance features are uncorrelated, since the relative intensities of the νCO absorbances at 2049, 1992, and 1924 cm-1 depend on the amount of coadsorbed water and CO on the surface. Temperature programmed desorption done with TGA-MS indicated three different high-temperature CO2 desorption peaks. These CO2 peaks (T ≈ 350, 400, and 550 °C) are most likely the result of the oxidation of adsorbed CO reacting with surface adsorbed water (COads + H2Oads → H2 + CO2) and/or the disproportionatio... |
| Databáze: | OpenAIRE |
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