Study On Mechanism And Techniques Of Simultaneous Desulfurization And Denitrification Based Upon Newtype TiO₂ Photocatalysis

In this experiment,the Zr,Ni and N-codoped nano-titania (NZN/T) was made by sol-gel method。TiO₂ supported photocatalyst was also prepared by this method.The photocatalytic activity of new types of TiO₂(NZN/T) photocatalyst was evaluated by degradation of methylene blue(MB), and compared with the removal efficiency of the non-doped titanium dioxide under visible light.The optimal doping ratio of Zr, Ni and N are 0.1%,0.1% and 14%.The optimum calcination conditions for 3 hours at 700℃calcined. The photocatalytic activity of NZN/T is 1.87 times than that of pure TiO₂. In the pilot-scale photoreactor, many influencing factors include temperature,concentration and gas flow were investigated in detail and a new approach and principle of SO₂ and NO simultaneous removal from flue gas was presented by doped-TiO₂ photocatalyst based on visible light technology. Ion chromatography (IC) indicated that the photocatalytic simultaneous desulfurization and denitrification products were sulfate and nitrate, the removal the mechanism of SO₂ and NO photocatalytic reaction was the photocatalytic oxidation reaction.In the self-made batch photocatalytic reactor the apparent kinetic parameters of photocatalytic removal of SO₂ and NO was studied. The results indicated that the photocatalytic oxidation reaction of SO₂ and NO are both second-order reaction. Activation energy of the two reactions is 21.497kJ/mol and 21.562kJ/mol, respectively.