NO Denitrification Agent Co(?)DETA Regeneration Catalysts

Wet process simultaneous desulfurization and denitrification technology has broad development prospects due to its high denitrification rate and rapid reaction rate.In this paper,Co(?)DETA solution was used to absorb NO by complecation to explore the best absorption conditions;then in order to solve the problem that Co(?)DETA can be easily oxidized to Co(?)DETA,tartaric acid was used to modify activated carbon and modified activated carbon which was then used to reduce Co(?)DETA.The best modification conditions and reaction conditions were confirmed ultimately.(1)Co(?)DETA solution was used to absorb NO by complexation and then the best absorption conditions were confirmed:the proportion of Co(?)and DETA was 1:3;the pH range was 6?6.5;the concentration of Co(?)DETA was 0.03 mol/L;the temperature of absorption was 5 0oC;(2)Tartaric acid was used to modify activated carbon and modified activated carbon which was then used to reduce Co(?)DETA,and the best modification conditions were confirmed:activated carbon was impregnated by tartaric acid of which the concentration was 0.25 mol/L for 14 hours in the impregnation proportion of 1.6 mL:1g.The characterization results of activated earbon and modified activated carbon showed that after modification,the acidie functional groups increased and total specific surface area was enlarged.The catalysis property of modified activated carbon was improved because of the improvement of both physical structure and chemical property;(3)The modified activated carbon was used to reduce Co(?)DETA,and then the best reaction conditions were confirmed:the pH range was 1.1?1.7;the mass of activated carbon was 50g/L.With the increase of reaction temperature and the concentration of Co(?)DETA,the reduction rate of Co(?)DETA was improved;(4)Based on the reduction of Co(?)DETA under different concentration of Co(?)DETA,the order of the reaction was estimated as 0.82.