Experimental Study On Preparation And De-NOx Characteristics Of Nano Ceramics Supported Vanadium Catalyst

In recent years, the increasingly serious air pollution, has affected our normal life seriously with the rapid development of economy in China. Nitrogen oxides is one of the main components of air pollution, but also the main reason of the formation of haze. Coal-fired power plants are the main source of nitrogen oxide emissions, the application of coal-fired power plant flue gas denitration technology has become an inevitable choice for the development of thermal power in China.Nowadays, the selective catalytic reduction (SCR) of NOx with NH3 is the mainstream technology of thermal power generating units denitration for its reliable, high-efficiency advantages. There are some problems such as catalyst sintering, catalyst fouling, (NH4)2SO4 sticking to catalyst, etc. These problems have a big influence on the denitration efficiency of thermal power plants.The performance of different supporter will bring a big difference corresponding denitration catalyst performance, has been found with the in-depth study of the selective catalytic reduction (SCR) of NOx with NH3. In this paper, nano TiO2 is prepared by the hydrolysis. The specific nano TiO2 variation of changes in size and morphology was studying by XRD, SEM characterization methods during the experiment of nano TiO2 changing from anatase to rutile as the temperature rising. Nano Bi3NbTiO9 ceramic powder with porous structure was successfully produced by molten salt method which is used for synthesizing nano-ceramic powders. The material properties Bi3NbTiO9 powder was study by analysis of TG-DTA, XRD, SEM, BET characterization results. The new V2O5-WO3/Bi3NbTiO9 denitration catalyst and the traditional V2O5-WO3/TiO2 denitration catalyst both were prepared by dipping These two materials. It is discovered that The new V2O5-WO3/Bi3NbTiO9 denitration catalyst has more advantages on denitration performance such as the denitration catalyst temperature window width, the impact of airspeed on DeNOx catalytic activity, ammonia nitrogen ratio on denitration catalyst, the size of the surface area; but the V2O5-WO3/TiO2 denitration catalyst has a greater advantage on the anti-SO2 respect through the catalyst denitration performance evaluation experiments which was carried out on autonomous denitration experimental bench. It is found that the strong physical adsorption capacity Bi3NbTi09 powder is the important reason that novel catalyst has more advantages than the traditional catalyst, combined with vanadium catalyst denitration reaction mechanism.