Regeneration of [Fe(II)‐NTA]− catalyzed by activated carbon in the simultaneous removal of sulphur dioxide and nitric oxide

Abstract

AbstractThe combined control of NO and SO2 can be finished with the [Fe(II)‐NTA]− solution because [Fe(II)‐NTA]− is capable of binding NO. However, the ability of [Fe(II)‐NTA]− to bind NO may be lost quickly due to the fast oxidation of [Fe(II)‐NTA]− to [Fe(III)‐NTA] by oxygen in the flue gases. To make it possible to put this technology into commercial application, efficient measures should be taken to regenerate [Fe(II)‐NTA]− to maintain the NO removal efficiency for a long time. The catalytic activity of activated carbon in the reproduction of [Fe(II)‐NTA]− has been investigated in a fixed‐bed reactor. The experiments indicate that [Fe(II)‐NTA]− reproduction increases with [Fe(III)‐NTA] and SO32− concentrations as well as temperature. Fast flow and high pH are unfavourable for the reproduction of [Fe(II)‐NTA]−. An NO removal efficiency of 80.11%–89.78% is sustained for a long period of time with the [Fe(II)‐NTA]− reproduction catalyzed by activated carbon. The reaction orders with respect to [Fe(III)‐NTA] and SO32− are 0.784 and 0.336, respectively. The apparent activation energy for this catalytic reaction is estimated to be 41.01 kJ mol−1.