Use of ferrous chelates of SH-containing amino acids and peptides for the removal of nitrogen oxides (NOx) and sulfur dioxide from flue gas

Biotrickling Filtration of Nitric Oxide

“…An analysis of the sample gas indicated that it contained approximately 5-8 ppm NO 2 in 1000 ppm NO. The flask's HNO 3 concentration was maintained at a fixed level by constant feeding of fresh acid and drawing of the wasted acid. The NO concentration in the air flowing to the biotrickling filter was varied by adjusting the bath temperature.…”

“…2 Chemicals designated for this purpose include chelating agents, potassium permanganate, O 3 , sodium chlorite, ClO 2 , and yellow phosphorus. 1,[3][4][5][6][7] Major drawbacks of wet chemical processes include expensive chemical additives, high water usage, and safety risks from handling some of these chemicals. 1 Biotreatment of NO x in air streams may offer an inexpensive alternative to the above-cited chemical processes.…”

Kinetics of gas–liquid reaction between NO and Co(NH3)62+

“…But existing wet flue gas desulphurization (FGD) scrubbers in power plants are incapable of eliminating NO from the flue gas because of its low solubility in water. Several methods have been developed to enhance NO absorption, including the use of oxidants to oxidize NO to the more soluble NO 2 [2][3][4] and the addition of various iron(II) chelates to bind and activate NO [5][6][7]. So far, none of these methods have been put into commercial application.…”

Removal of NOx from Flue Gas with Iron Filings Reduction Following Complex Absorption in Ferrous Chelates Aqueous Solutions

“…[1][2][3][4][5][6][7][8][9] After the complex processes have been studied for more than 20 years, it is clear that it is difficult for the absorption solution to be regenerated and reused circularly, and the commercial applications of the process have been impeded because of the following problems. First, ferrous ion can be oxidized easily to ferric ion by the oxygen (O 2 ) in the flue gases, and the ferric chelates cannot complex with NO; therefore, the amount of removal NO in the process decreases rapidly.…”