Selective Catalytic Reduction Of NO With NH₃ Over MnO_x-V₂O₅-CeO₂/SiO₂-ZrO-TiO₂ Monolith Catalyst

Nitrogen oxides (NOx) is one of the main pollutants of the atmosphere, The emission of nitrogen oxides increased with the number of motor vehicles and the rapid development of thermal power generation. NO not only causes environmental pollution but also endangers human health. Due to the adverse effects of nitrogen oxide on the atmospheric environment and the current grim situation, to develop denitrification technology has become the world's research priorities.Nowadays, NO flue gas treatment is the main use of flue gas denitrification technology, selective catalytic reduction technology in which ammonia is most widely used technology. Catalyst plays an important role in selective catalytic reduction technology. The catalytic activity directly affects the level of denitrification efficiency.In this work, MnOx-CeO2 was used as active component, V2O5 is a promoter, and Si02-Zr0-TiO2(ASZT) compound materials was homemade support, utilizing sol-gel method to prepare different molar ratio of catalysts, and test these activity of DeNOx in a fixed quart bed. The experimental results showed that MnOx-VaO5-CeO2/SZT monolith catalyst performed high activity between 80℃and 480℃. Based on the results of BET, XRD and Raman test methods, crystal structure and prepared conditions of catalysts were discussed, and yielded the proper molar ratio of component of catalysts and prepared technics. Flue gas temperature, n (NH3)/n (NO), O2 concentration, NH3 and NO import of concentration on NO conversion were studied, the results show that the catalyst MnOx-V2O5-CeO2/SZT optimum temperature range is 160～320℃. NO removal rate of go up with the increase of the ratio of ammonia and nitrogen, but greater than 1.2, NO removal rate did not Basically change, the best ratio of ammonia and nitrogen is 1.2. NO removal rate increases with O2 injection rate of which the bestoncentration of O2 is 3%; The best NO inlet concentration is 1000ppm.