Low-Temperature O3 Decomposition over Pd-TiO2 Hybrid Catalysts

Catalysts

Fathi Karouia¹  Stéphane Daniele²  Jean-Marc Clacens³  Houcine Touati³  Frédéric Richard³  Catherine Batiot-Dupeyrat³  Afef Mehri⁴ 

[1] Blue Marble Space Institute of Science, Exobiology Branch, NASA Ames Research Center, Moffett Field, CA 94035, USA;Catalyse, Polymérisation, Procédés et Matériaux, CP2M-ESCPE Lyon, UMR 5128, 43 Bld du 11 Novembre 1918, CEDEX, 69616 Villeurbanne, France;Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285, ENSI Poitiers, Université de Poitiers-CNRS, 4 rue Michel Brunet, BP633, CEDEX, 86022 Poitiers, France;U.R. Matériaux et Synthèse Organique UR17ES31, Institut Préparatoire aux Etudes d’Ingénieur de Monastir, Université de Monastir, Monastir 5019, Tunisia;

关键词: ozone decomposition;    Pd-based catalyst;    TiO₂ hybrid support;   

DOI  :  10.3390/catal12040448

来源: DOAJ

【 摘 要 】

In aircraft and spacecraft, outside air is not directly fed to the passenger because it contains ozone at elevated altitudes. The decomposition of low concentration ozone in the air was carried out at 25 °C by catalytic oxidation on Pd-based catalysts supported on a high surface area hybrid TiO₂. The use of these hybrid catalysts has shown a beneficial effect, both on the catalytic activity and on the catalyst stability. Kinetic studies showed that the most promising catalytic phase (Pd/TiO₂_100) was the one obtained from the TiO₂ support containing the lowest content of citrate ligands and leading to small Pd particles (around 4 nm). The effect of catalyst synthesis on the decomposition of O₃ gas (15 ppm) in a dry and humid (HR = 10%) stream in a closed environment such as aircraft or spacecraft was also investigated in this study and further elucidated by detailed characterizations. It was shown that the system could be used as an effective treatment for air coming from outside.

【 授权许可】

Unknown