Volatile organic compounds (VOCs) are one of the most relevant air pollutants as they act as precursor agents for photochemical smog, acid rain and other noxious compounds. Catalytic oxidation stands out as an abatement method of VOCs thanks to its high efficiency and low energy requirements. Within this approach, catalysts based on cobalt and manganese are remarkable systems due to their excellent redox properties and the oxygen mobility within the mixed oxides structures.

In this work, CoMnMgAl-O_x type catalysts were prepared by a microwave (MW) assisted self-combustion synthesis method varying the Co/Mn molar ratio between 0 and 1, the MW irradiation power between 80 and 500 W and the impregnation or non-impregnation with platinum at 1.0 %. The catalysts were characterized by XRD, N₂ adsorption-desorption isotherms, HR-TEM and XPS techniques and evaluated in the catalytic oxidation of toluene in diluted gas phase at atmospheric pressure. All solids prepared by MW showed higher catalytic activities than their equivalents prepared by traditional self-combustion, demonstrating that the use of microwaves in the synthesis enhances the catalytic activity of materials in the oxidation due to the prevalence of Co (III) species and a smaller particle size. Additionally, it was found that the Co/Mn = 0.6 M ratio in the oxide, gives rise to the most active catalyst, presenting conversions comparable to those of the catalysts impregnated with platinum.

挥发性有机化合物（VOC）是最相关的空气污染物之一，因为它们是光化学烟雾，酸雨和其他有毒化合物的前体。催化氧化由于其高效率和低能耗的要求而成为减少VOC的方法。在这种方法中，基于钴和锰的催化剂是出色的系统，因为它们具有出色的氧化还原特性和混合氧化物结构内的氧迁移率。

在这项工作中，CoMnMgAl-O _x型催化剂是通过微波（MW）辅助自燃烧合成方法制备的，Co / Mn摩尔比在0和1之间，MW辐射功率在80和500 W之间，并且浸渍或不浸渍-以1.0％的铂浸渍。催化剂用XRD，N ₂表征。吸附-解吸等温线，HR-TEM和XPS技术，并在大气压下稀释的气相中甲苯的催化氧化中进行了评估。MW制备的所有固体均比传统自燃制备的固体具有更高的催化活性，这表明由于Co（III）物种的普遍存在，微波在合成中的使用增强了材料在氧化反应中的催化活性，并且较小。粒度。另外，发现氧化物中Co / Mn ＝ 0.6M的比例产生了最具活性的催化剂，其转化率可与浸渍铂的催化剂相比。