Catalytic Combustion Of Volatile Organic Compounds On CuMnOx/γ-Al₂O₃ Added Rare Earth

With the development of society and economy,environmental pollution has gradually become a general concern around the world.Volatile Organic Compounds (VOCs) as an important source of air pollution,its control method is also more and more importance.Catalytic combustion is efficient,economic,high removal efficiency, no secondary pollution,low energy consumption,so it is one of effective ways to deal with VOCs.The results showed that rare earth elements had good oxygen storage function,transition metal catalyst in an appropriate amount of rare earth elements added to improve the catalytic performance of catalysts.It could effectively improve the catalytic activity of catalyst,and lower light-off temperatureThis paper mainly studied with catalytic combustion of toluene on the Cu-Mn-Ce composite oxide catalysts.And the catalysts were prepared by dipping method, characterized by SEM,XRD and BET.The best atomic ratio of Cu,Mn and Ce we determined that is1:2:0.2.When the cerium nitrate mass concentration is 0.0278g/ml, we could get a higher catalyst activity.The calcinations temperature had great influence on catalyst activity.When the temperature is above 600℃,because of the existence of the Cu-Mn-spinel crystal,the catalyst had higher activity.It was also studied the influence of reactor movement parameter to VOCs catalytic combustion efficiency.It was found that when airspeed less than 2 seconds,the catalysts had better activity.The different VOCs density and the component had little influence to the efficiency of the catalyst catalytic combustion.Finally,the experiment compared with the catalysts of Cu-Mn complex oxide catalyst with and without rare earth.It was found that T99 catalysts with rare earth had lower temperature of 30℃than the catalysts without rare earth,which had higher low temperature activity and could reduce reaction temperature for a wide range of VOCs.