open access

https://hdl.handle.net/2115/97221

Removal and complete combustion of 1,4-dioxane in water by a two-step reaction combining adsorption and catalytic combustion

英語

Platinum catalyst

2024-07

Elsevier

Journal of Water Process Engineering

64

105658

Catalytic wet air oxidation is not so effective to decompose 1,4-dioxane in water, while there have been several studies on this reaction. As an alternative, we propose a two-step purification system for removal and complete combustion of 1,4-dioxane, where the first step is removing 1,4-dioxane from water by adsorption, and in the second step, the adsorbent is heated to release 1,4-dioxane, and the released 1,4-dioxane is completely combusted by gas -phase catalytic reaction. We had searched for adsorbents and combustion catalysts suitable for the system and found a high -silica MFI zeolite and Pt/SiO 2 , respectively. The high -silica MFI zeolite adsorbed up to 121 mg g -1 of 1,4-dioxane, and 1.1 mmol L -1 of 1,4-dioxane in water was almost completely removed by 10 g L -1 dose. The zeolite was reusable for adsorption -desorption cycles at least five times without any loss of the performance. Pt/SiO 2 was highly active for the complete combustion of 1,4-dioxane even at 200 degrees C. By using the high -silica MFI zeolite and Pt/SiO 2 , we conducted the release of 1,4-dioxane from the zeolite by heating and the gas -phase catalytic combustion of 1,4-dioxane using two reactors connected in series, which were filled with the zeolite and Pt/SiO 2 , respectively, and demonstrated that all 1,4-dioxane was released by 300 degrees C and was completely combusted in the upstream and downstream reactors, respectively.

学術雑誌論文

Accepted Manuscript

Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

© 2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

2214-7144