Study on Catalytic Activity of Urea Mixed with Nitrogen and KOH Activation for Sludge Carbon
Municipal sludge was used as raw material and urea was used as nitrogen source to prepare sludge carbon.NO denitrification by catalytic oxidation at room temperature was carried out to explore the influence of urea nitrogen doping and KOH activation on the catalytic activity of sludge carbon.The best addition ratio of KOH and the best addition time of urea were determined.Sludge carbon was prepared at 700℃after car-bonization and activation,which was doped with nitrogen and with different KOH addition ratio.The results showed that the sample NCK*(3:1)-7 was prepared at 700℃with sludge and KOH ratio of 3:1 and nitrogen doping in the carbonization stage,showing the highest denitrification efficiency of 54.7%,which was 18.3%higher than that of sludge carbon without KOH;Urea nitrogen doping and KOH activation affect each other during sludge py-rolysis;Both urea and KOH can improve the catalytic performance by increasing the specific surface area and enriching the pore structure.
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