Experimental Study On Mercury Oxidation And Adsorbtion Of SCR Catalysts Under Coal-Derived Flue Gas

In recent years, because of a great deal of establishment of the coal-burning power station, and in a period of time the coal is still an extremely important energy of the world. As a result of pollutant such as SO_x, NO_x, CO₂ etc., the problem of coal-burning that caused an extensive concern in the scope of the world, particularly the mercury pollution, will produce serious bane to the mankind's health and the ecosystem environment. How to find economic and effective method to take off the pollution of the SOx,NOx and the heavy metals ? The research of this aspect is still placed on the road. Making use of the selectivity catalyst Reductation method(SCR) can reduce NOx in the coal-fired flue gas. And it is also reported that SCR system can oxidize mercury as well, so this thesis paid attention on the mercury oxidation in the SCR system.This text firstly synthesized lately data at home and abroad, then took off to the control of the mercury in the coal-fired flue gas. Then in the purpose of studying the influence of the different factor upon the mercury species'variety in the SCR process, we made use of six kinds of different catalysts (V₂O₅/SiO₂, V₂O₅/TiO₂, V₂O₅/TiO₂< sol-gel>, WO₃/TiO₂, V₂O₅-WO₃/TiO₂, CuO/γ-Al₂O₃) in the experiments. The point is to investigate the influence on mercury oxidation and catalysts'adsorbtion of ammonia concentration, SCR temperature, and different catalysts, and in the addition, we carry on an evaluation to the different catalysts.Then, in order to carry on the deep discussion for the mercury catalysis oxidized mechanism, we analyzed some mercury catalysis oxidized and adsorbed model in SCR process, and compare the results with experimental results. The final result shows that they match well.