This paper includes a theoretical overview of additive manufacturing technologies, classification and characterization of structured catalysts and volatile organic compounds, and a description of the catalytic oxidation process. The experimental part covers the making of structured monolithic catalyst supports in the form of static mixers, using additive manufacturing technology, i.e. 3D-printing, which are then used for the catalytic oxidation of benzene, toluene, ethylbenzene and o-xylene (BTEX). A catalytically active component (MnFeOx) is previously applied to the prepared structured supports by impregnation. Catalytic oxidation of BTEX is carried out for different geometries of structured catalyst supports at different temperatures with a constant flow of the reaction mixture. Based on the obtained results, it was found that for all components of the BTEX mixture, maximum conversions are first achieved for the static mixer system with the largest geometric surface, at lower temperatures. Then the trend according to the size of the geometric surface is followed, with the fact that the maximum conversions of all components were achieved at significantly higher temperatures for the static mixer system with the smallest geometric surface. It can be concluded that static mixers with a larger geometric surface give better results, i.e. they achieve higher conversion at lower temperatures. By comparing the values of temperatures T10, T50 and T90 at which 10 %, 50 % and 90 % conversion are achieved, it is observed that for all geometries of static mixers, the trend of reactivity during oxidation is followed in the order: o-xylene > ethylbenzene > toluene > benzene, which means that benzene oxidizes last.