The catalytic hot-gas filtration procedurally allows for a NOx-SCR with a simultaneous exhaust gas dust extraction in the temperature range of >260°C. In order to make a large industrial operation possible in the near future, a pilot system in the cement plant Zementwerk Hatschek GmbH in Gmunden is set to explore this technology further. This thesis presents the optimization of the pilot system as well as the exploration of a catalytic deactivation which has happened upfront. The first part of this thesis pursues the theoretical principles of the exhaust gas purification, the catalytic hot-gas filtration, the catalytic process in general as well as the structure and operation of the pilot plant. Furthermore, an outlook is given on the possibilities that lie in the use of the industrial heat, which is made usable through the hot-gas filtration. The optimization looks at the dust extraction of the kiln exhaust gas. More precisely the focus lies on the dedusting of the filter media, consisting of candle-shaped ceramic elements with catalytic activity, due to pressured air and on the pressure propagation inside the filters. The second focal point is the assessment of a catalytic deactivation, which lead to the prevention of a proper denitrification. The chronological events have been analysed and a number of potential causes have been examined systematically. In the last section, this thesis elaborates on a thallium intoxication as an outcome. It explores the listing of this heavy metal, its performance within the system and the potential development of circulatory systems.