| The different varieties of doping modified nanometer TiO2photocatalyst were prepared by adopting sol-gel method, the photocatalytic efficiency is also tested. Taking clay with strong adsorbability as a carrier, clay particles supported TiO2photocatalyst is manufactured. The characterization analysis of TiO2particles is carried out using EDS and XRD. Taking SO2as a target, the experiment is done in the small reactor, The results show that in the best condition the oxidation efficiency of nitrogen co-doped vanadium TiO2can reach as high as98.14%and the one of clay particles supported TiO2is78.56%. In the experiment in the vertical homemade photocatalytic reactor, the best efficiency of clay supported TiO2particles oxidizing SO2is48.9%. The factors which can affect the velocity field and temperature field of fluidized bed can be analyzed with simulations using FLUENT software and appropriate mahematical model. The velocity field and temperature field in visible conditions drawn by FLUENT show that the the height of the bed makes no influence on the fouidzation performance basically, the diameter of clay particle of1.5g is10mm when the inlet velocity is0.4m/s. The gas appears fluidized bed form at the height of20mm in the bed. The calculation shows that in light condition the temperature at the top changes but not the bottom, and it indicates that the light is not enough in the gas-solid reaction. The results also show that the gas velocity, clay particles velocity and clay particles concentartion are unstable at the height of5cm, and it indicates that the contact and reaction of gas and TiO2is uneven. It is the mian factor which affects the vertical photocatalytic reactor efficiency, and the conclusion is the same as the results of the experiment. |
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