Catalytic decomposition performance for O3 and NO2 in humid indoor air on a MnO /Al2O3 catalyst modified by a cost-effective chemical grafting method
| Autor: | Michel Ondarts, Evelyne Gonze, Jonathan Outin, Y. Gonthier, Longwen Chen |
|---|---|
| Přispěvatelé: | Laboratoire Optimisation de la Conception et Ingénierie de l'Environnement (LOCIE), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Ozone 02 engineering and technology 010402 general chemistry Heterogeneous catalysis 7. Clean energy 01 natural sciences Catalysis chemistry.chemical_compound Transition metal [CHIM.ANAL]Chemical Sciences/Analytical chemistry Environmental Chemistry [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering ComputingMilieux_MISCELLANEOUS NOx Alkyl General Environmental Science chemistry.chemical_classification Silanes [CHIM.CATA]Chemical Sciences/Catalysis [CHIM.MATE]Chemical Sciences/Material chemistry General Medicine 021001 nanoscience & nanotechnology Decomposition 0104 chemical sciences chemistry Chemical engineering 13. Climate action 0210 nano-technology |
| Zdroj: | Journal of Environmental Sciences Journal of Environmental Sciences, Elsevier, 2018, 74, pp.58-70. ⟨10.1016/j.jes.2018.02.006⟩ |
| ISSN: | 1001-0742 |
| Popis: | Processes based on non-thermal plasma (NTP) for indoor air treatment inevitably lead to the formation of toxic by-products such as ozone (O3) and nitrogen oxides (NOx). Adding a step of heterogeneous catalysis in series with NTP could allow for the decomposition of the by-products. Therefore, different catalysts were developed based on transition metal oxides, such as NiOx, CoOx and MnOx with different weight percentage 1, 5 and 10 wt.%, deposited on a γ-Al2O3 support. The O3 removal efficiency (ORE) and the NOx removal efficiency (NRE) were very encouraging in dry air: about 65% and 80%, respectively, by using 2 g 5 wt.% MnOx/Al2O3 catalyst under the experimental conditions. However, strongly negative effects of relative humidity (RH) on the catalytic decomposition performance were observed. To overcome this limitation, the catalyst surface was modified to make it hydrophobic using a cost-effective chemical grafting method. This treatment consisted in impregnating the 5 wt.% MnOx/Al2O3 catalyst with different trichloro(alkyl)silanes (TCAS). The effects of different linker lengths and amounts of TCAS for the hydrophobicity and the decomposition performance of surface-modified catalysts under humid conditions were investigated. Our results show that the surface-modified catalyst with the shortest linker and 0.25 mmol/gcat of modifying agent represents the best catalytic decomposition performance for O3. Its ORE is 41% at 60% RH, which is twice that of the non-modified catalyst. |
| Databáze: | OpenAIRE |
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