Influence of Mn valence state and characteristic of TiO2 on the performance of Mn–Ti catalysts in ozone decomposition
| Autor: | Sung Chang Hong, Dong Wook Kwon, Geo Jong Kim, Jong Min Won |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Ozone Valence (chemistry) Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Medicine Manganese 010402 general chemistry 021001 nanoscience & nanotechnology Manganese oxide 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Environmental Chemistry Atomic ratio 0210 nano-technology Waste Management and Disposal Water Science and Technology |
| Zdroj: | Environmental Technology. 38:2785-2792 |
| ISSN: | 1479-487X 0959-3330 |
| Popis: | The effects of physicochemical properties of Mn–Ti catalysts on O3 conversion were examined. The catalysts were prepared by a wet impregnation method that gave manganese supported on various commercial sources of TiO2. The properties of the catalysts were studied using physicochemical techniques, including Brunauer–Emmett–Teller (BET) surface area analysis, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), and thermal gravimetric analysis (TGA). The O3 decomposition tests of Mn–Ti catalysts with various manganese loadings revealed that the 10 wt% manganese catalyst exhibited optimal, excellent activity. The O3 conversion and Mn valence state of the Mn–Ti catalysts were different, depending on the structure of the TiO2 source. Increasing the O/Ti surface atomic ratio in TiO2 increased the Mn3+ ratio. The Mn3+ ratio directly affected the O3 decomposition activity of the Mn–Ti catalyst. When the Mn3+ ratio was the largest, the catalyst show... |
| Databáze: | OpenAIRE |
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