Division of Environmental Physics -
Students Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava
Diana RAČKOVÁ MSc. student
MSc. study Supervisor: Karol Hensel Consultant: -- Title: Tar removal from gas exhaust by combination of plasma and catalyst Abstract:
Bc. study 2016 - 2017
Supervisor: Karol Hensel Consultant: Richard Cimerman Title: Naphtalene removal by combination of plasma and catalyst Abstract: Biomass differs from others renewable energy sources by the possibility of its targeted agricultural production. The most effective way to generate energy from the biomass is its gasification, that leads to production of syngas, that besides the desired gaseous components also contains ash, sulfur and nitrogen oxides and most importantly tars. Tars are a mixture of condensable hydrocarbons, usually aromatic compounds with one or more benzene rings and they may cause many technical issues in combustion equipment and have negative effects to environment and to humans. Syngas contaminated by tars cannot be used for energy production and therefore effective methods of tar decomposition have been sought. In this work, we focus on removal of tars by combination of plasma and catalyst. We constructed two identical types of reactor utilizing dielectric barrier discharge one with and one without a catalyst (TiO2 pellets). In both reactors we monitored chemical changes induced by the discharges as a function of gas mixture, composition and temperature, and amplitude and frequency of the applied voltage. We evaluated efficiency of decomposition of naphthalene, used as a model tar compound, in both reactors and analyzed by-products of its decomposition by FTIR spectroscopy. Results showed efficient decomposition of naphthalene by plasma to carbon oxides, water and solid product. Plasma catalytic system showed even better efficiency. The results proved that plasma in combination with catalyst is an efficient tool that can be used for syngas cleaning from tars and even other toxic compounds.