Genty Eric, Serhal Cynthia Abou, El Khawaja Rebecca, Dib Hadi, Labaki Madonna, Mallard Isabelle, Poupin Christophe, Siffert Stéphane, Cousin Renaud
Université du Littoral Côte d'Opale (ULCO), Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV, E.A. 4492), MREI, F-59140 Dunkerque, France.
Lebanese University, Laboratory of Physical Chemistry of Materials (LCPM)/PR2N, Faculty of Sciences, Fanar, P.O. Box 90656, Jdeidet El Metn, Lebanon.
J Nanosci Nanotechnol. 2020 Feb 1;20(2):1130-1139. doi: 10.1166/jnn.2020.16978.
Catalytic total oxidation is an effective technique for the treatment of industrial VOCs. This emission is generally accompanied by the presence of other products like CO, NO or other VOC. In this paper, the development of catalysts for the total oxidation of CO and toluene mixture is performed. For this study, MgAl₂HT hydrotalcites precursors were synthesized by three different methods: co-precipitation, microwaves and ultrasound assisted method. Hydrotalcite precursors have been used in order to develop mixed oxides after calcination for the catalytic oxidation test. Hydrotalcite structure as well as the mixed oxides obtained after calcination was studied, by several techniques: XRD, TEM, DTA/TG, BET, N₂ sorption, H₂-TPR. The physico chemical studies revealed modification in the structural characteristics (surface area, porosity) as well as in reducibility properties of the formed mixed oxides. The nanocatalyst issued from microwaves synthesis was the most active in these studied reactions for the total oxidation of the mixture. Moreover, addition of CO on the reaction mixture allows obtaining a beneficial effect on the toluene oxidation.
催化完全氧化是一种处理工业挥发性有机化合物（VOCs）的有效技术。这种排放通常伴随着其他产物的存在，如一氧化碳（CO）、一氧化氮（NO）或其他挥发性有机化合物。本文开展了用于CO和甲苯混合物完全氧化的催化剂的研发工作。对于本研究，采用三种不同方法合成了镁铝水滑石前驱体：共沉淀法、微波法和超声辅助法。水滑石前驱体用于在煅烧后制备混合氧化物以进行催化氧化试验。通过几种技术对水滑石结构以及煅烧后得到的混合氧化物进行了研究：X射线衍射（XRD）、透射电子显微镜（TEM）、差示热分析/热重分析（DTA/TG）、比表面积测定（BET）、氮气吸附、氢气程序升温还原（H₂-TPR）。物理化学研究揭示了所形成混合氧化物的结构特征（表面积、孔隙率）以及还原性能的变化。微波合成法制备的纳米催化剂在这些研究的混合物完全氧化反应中活性最高。此外，在反应混合物中添加CO对甲苯氧化有促进作用。
