Simultaneous absorbing SO_2 and NO using solution of triethylenediamine cobalt(III) coupled with urea
Absorption and catalytic oxidation of nitric oxide could be achieved by using Co(en)~~(3+)_3.When simultaneous absorbing SO_2 and NO,the precipitation of Co_2(SO_3)_3 would be yielded and the NO removal would be decreased.When urea existed in the absorbing solution,the oxidation rate of SO~(2-)__3 would be increased and high NO removal would be achieved for a long time.A larger concentration of Co(en)~~(3+)__3 could increase NO removal rate.The existence of urea could keep a high NO removal rate when simultaneous absorbing SO_2 and NO.A higher NO removal rate and a higher oxidation rate of SO~~(2-)__3 could be achieved in the range of 60—70℃.The NO removal rate and SO~(2-)__3 oxidation rate are controlled by the surface area and coefficient of gas-liquid mass transfer.