Thermally-induced activation of titanium dioxide and its application to the oxidation of gaseous toluene
| Autor: | Yoshinari Kobayashi, Tadayoshi Ihara, Shuhei Takahashi, Naoki Kasuya, Harumitsu Nishikawa |
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| Rok vydání: | 2019 |
| Předmět: |
Anatase
Materials science Thermal decomposition Binding energy Analytical chemistry General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Toluene 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Vacancy defect Titanium dioxide Thermal 0210 nano-technology |
| Zdroj: | Applied Surface Science. 479:1105-1109 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.02.190 |
| Popis: | Thermally-inducing activation mechanism of titanium dioxide (TiO2) in air was investigated using X-ray diffraction (XRD) measurement and X-ray photoelectron spectrometry (XPS) under high temperatures. TiO2 (anatase) crystal expanded toward the c-axis direction as compared with the a-axis direction under heating. These show that the anatase crystal was distorted under high temperature, that is, the lattice vacancy generated in the crystal at high temperatures from the XRD measurement. It was recognized that Ti3+ (binding energy of 457.8 eV) in TiO2 increased slightly with temperature rise from the XPS. The decreasing of the ratio of O/Ti with heating would indicate that the oxygen vacancy in TiO2 increased with heating. From these results, the thermal activation of TiO2 must be induced by the generation of oxygen vacancy and Ti3+ in TiO2 at high temperatures followed by the formation of trapped electron. The oxidative decomposition of toluene over TiO2, as an application to the oxidation of organic compounds, was superior to the only thermal decomposition over SiO2. |
| Databáze: | OpenAIRE |
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