This dissertation investigated the possibility of using the commercially available photosensitive resin Ceramic resin for the fabrication of ceramic monolithic catalyst carriers by using stereolithography as one of the additive manufacturing techniques. Specific objectives included 3D-printing of monolithic carriers with different geometries, developing and applying a suitable technique for depositing a catalytically active layer (mixed oxides of Mn, Cu, Fe, and Ni) on the prepared monolithic carriers, including different designs of static mixers as potential active component carriers, and testing their effectiveness for oxidation of a mixture of aromatic volatile organic compounds (BTEX) and individual model components. A total of 12 different functional variants of 3D-printed monolithic catalyst carriers were prepared, 5 of which were in the form of static mixers. The influence of different preparation parameters on the physicochemical, thermal, mechanical and catalytic properties of different designs of structured catalysts and the influence of process conditions on the oxidation rate of aromatic volatile organic compounds were studied in detail. X-ray diffraction analysis showed that the ceramic phase of the ceramic resin composite was composed of SiO2, i.e., cristobalite, a mineral that is a temperature-dependent polymorphic modification of quartz, was formed after heat treatment. The elemental composition was confirmed by EDX analysis, where excellent agreement was obtained with literature values for the same resin. The size of the ceramic particles in the resin used was determined by the laser diffraction method. The results of the analysis showed that the size of the ceramic particles ranged from 0.5 μm to 414 μm. The median value of the particle size (d50) in the population is 34.8 μm. The predominant size of the ceramic particles in the population (dmode) is 44.7 μm, while the Sauter diameter (d3,2) of the particles is 91.5 μm. The thermal properties of the ceramic resin were investigated by simultaneous TGA / DTA analysis. Dimensional stability tests were performed to experimentally determine the dimensional correction factors that must be considered in 3D-printing of monolithic catalyst carriers to obtain the desired dimensions after heat treatment. The pressure drop in the reactor system was measured with all fabricated monolithic catalyst carriers. The test results showed almost negligible pressure drop under the operating conditions used in the study. Scanning electron microscopy was used to gain insight into the morphology of the 3D-printed carriers with and without an applied catalytic layer and to determine the thickness of the applied catalytic layer. The composition of the most catalytically active manganese mixed oxides (MnFeOx and MnCuOx) was confirmed by Raman spectroscopy. Comparison with the results of X-ray diffraction analysis and X-ray photoelectron spectroscopy successfully determined the composition of the mixed metal oxides present. The catalyst layer was applied by the wet impregnation technique and the sol-gel technique. The results of the study of the adhesion of the catalytic layer to monolithic carriers showed excellent results with less than 2 % weight loss after half an hour of exposure to ultrasound at an operating frequency of 37 kHz. From the measurements of catalytic activity of the prepared monolithic catalysts, it was concluded that impregnation is a more suitable method. The chemical composition of the catalyst bed was also optimized with respect to the expected conversions of the model components. The most efficient geometry of the 3D-printed monolithic catalyst carriers was found to be the geometry of the ZS carrier, which contained additional structural elements on the outside of the wall. The 3D-printed monolithic ZDP carrier had the largest geometric surface area (28 cm^2), the largest catalytic bed mass (12.4 mg), and exhibited even slightly higher catalytic activity in comparison with a commercial (cordierite) monolithic carrier with similar geometric surface area (29 cm^2) that was coated with the same catalytic layer. The results of the catalytic activity tests showed that all four BTEX components are removed from the reaction mixture already at a temperature of 179 °C, which is of great economic importance considering their application in real systems. In the last part of the research, the analysis and modeling of a monolithic reactor was carried out. For this purpose, a one-dimensional (1D) heterogeneous reactor model was proposed, which includes a kinetic model for the first-order reaction. A comparison of the results obtained with a BTEX mixture and single BTEX compounds was performed. The evaluation of the acceptability of the proposed model, performed on the basis of the corresponding root values of the standard deviation between the experimentally obtained and the theoretically predicted values showed that the proposed model successfully described the experimental results. Based on the fact that the heterogeneous 1D model is derived based on the corresponding balances for the model components in the gas phase and the balance for the model components on the surface of the catalytic layer, which corresponds to the physical picture of the process, it was concluded that the proposed model is suitable for describing the catalytic oxidation of BTEX and related aromatic volatile organic compounds using heterogeneously structured catalysts. The results presented in this dissertation demonstrate the extraordinary potential and great possibilities of the application of additive manufacturing technology in the fabrication of complex designs of catalysts and chemical reactors. It was confirmed that the stereolithography technique can successfully fabricate ceramic monolithic carriers comparable in catalytic properties and application characteristics to catalysts made of commercially available cordierite ceramics, with particular emphasis on their greater flexibility in the fabrication of complex geometric shapes.