Removal of NO from flue gases by absorption to an iron(ii) thiochelate complex and subsequent reduction to ammonia

Pham, Eric K.; Chang, Shuenn‐Yih

doi:10.1038/369139a0

Cited by 123 publications

(97 citation statements)

References 15 publications

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“…We did not observe a reaction between NO and either of the Fe(III) complexes, although both complexes are known to undergo quasireversible reduction to Fe(II) in solution, which is apparent in cyclic voltammograms (39,40). There are numerous reports of binding and reduction of NO by Fe(II) generated chemically or electrochemically (20)(21)(22)(23)(41)(42)(43), which suggested to us that reduction of the metal complexes to Fe(II) would provide in vivo NO scavengers similar to those observed with other iron complexes (44,45). The cyclic voltammogram of 4 (Fig.…”

mentioning

confidence: 95%

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Kazmierski

Wolberg

Wilson

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

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The hydroxamic acid siderophore ferrioxam- Nitric oxide (NO), a short-lived potent vasodilator, was first described as the endothelium-derived relaxation factor (EDRF) (1-3). The formation of NO from the guanidino nitrogen group of L-arginine is catalyzed by a group of enzymes termed constitutive (cNOs) and inducible (iNOs) NO synthases (3,4). The inducible form is not present constitutively in mammalian cells but is induced by proinflammatory stimuli such as bacterial lipopolysaccharide (LPS), Corynebacterium parvum, and the cytokines tumor necrosis factor-a, interleukin-1, or interferon-y, individually or in combination (5). Excess production of NO is reported to be associated with the development of hypotension associated with endotoxemia and sepsis (6-8).Inhibition of iNOs is a potential therapeutic approach to the treatment of septic shock (6-9). However, mechanisms to protect against the deleterious effects of NO overproduction constitute an alternative approach. For instance, free hemoglobin can scavenge NO and inhibit its biological effects (10). In LPS-treated mice, formation of a paramagnetic mononitrosyl iron complex with diethyldithiocarbamate (NO Fe DETC) was detected and characterized by electron paramagnetic resonance (11). The NO formed in this animal model was trapped with endogenous Fe2+ complexed with a considerable amount (500 mg/kg) of DETC that was administered to the animals during the course of the experiment (11). Mortality was not addressed in this study. On the other hand, administration of vitamin B12A to mice prevented and reversed endotoxinmediated hypotension and decreased mortality, possibly through binding of the vitamin with excess NO (12). Inhibition of several actions of NO, including protection of rats against endotoxin, was demonstrated with the NO scavenger 2-phenyl-4,4,5,5-tetramethylimidazolineoxyl-i-oxyl 3-oxide (13). We and others have characterized the in vivo models of induction of iNOs in mice and rats injected with C. parvum or C. parvum + LPS (14-18). We postulated that iron complexes could act as general NO scavengers and provide protection against septic shock. We screened a library of metal chelators and chelates and found that [Fe(III)

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mentioning

confidence: 95%

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Kazmierski

Wolberg

Wilson

et al. 1996

Proc. Natl. Acad. Sci. U.S.A.

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“…Many alternatives to the SCR process that are based on wet scrubbing have been widely studied in the US [5][6][7][8], Japan [9,10] and Netherlands [11][12][13]. Flue gas contains several hundred ppm of NO x and most of the NO x is in the form of nitric oxide (NO).…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics of NO removal by cobalt diethylenetriamine solution

Tan

Jiang

Luo

et al. 2010

Korean J. Chem. Eng.

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The cobalt(II) diethylenetriamine ([Co(dien) 2 ] 2+ ) complex is a newly developed metal thiochelate for the removal of NO from flue gas. The performance characteristics of NO absorption into [Co(dien) 2 ] 2+ solution were studied in a stirred reactor. The experimental results showed that this absorption could be regarded as fast pseudo-mth-order reaction and the reaction rate could be expressed as second-order with respect to NO concentration and first-order with respect to [Co(dien) 2 ] 2+ concentration. The enhancement factor was 1609.1 at the [Co(dien) 2 ] 2+ concentration of 0.01 mol/L. Its optimal absorption conditions were temperature 50 o C, NO concentration 540 ppm, [Co(dien) 2 ] 2+ concentration 0.02 mol/L and O 2 concentration 6%, which were determined by orthogonal experiment.

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“…Among them, NaClO 2 shows high absorption rates, and its wastewater is relatively easy to manage, e.g., by simply adjusting its pH and COD values [6]. Yang and Shaw [7] indicated that NO can be quantitatively oxidized to NO 3 -by NaClO 2 in aqueous solution. Due to the production of HNO 3 , the pH value drops sharply from 10 to 3 within minutes of operation.…”

Section: Introductionmentioning

confidence: 99%

“…To reduce the amount of NO x emitted from stationary combustion sources, several dry, wet and bio-treatment processes have been discussed [1][2][3]. Among these technologies, wet methods are the most economically competitive and have the advantage of controlling other acid gases and particulates at the same time [4].…”

Section: Introductionmentioning

confidence: 99%

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

Jiang

Cai

et al. 2008

Chem Eng & Technol

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The absorption rates of NO into aqueous solutions of NaClO 2 blended with Na 2 CO 3 were investigated in a stirred reactor. The experimental results showed that the reaction rate could be expressed as N NO 0:for a second-order reaction rate constant between NO and NaClO 2 , k mn = 5.79 · 10 15 exp(-5557.26/T), was obtained. The addition of Na 2 CO 3 into the solution of NaClO 2 decreased the reaction rate constant. The optimal absorption conditions involved a NO concentration of 540 ppm, NaClO 2 concentration of 50 mol m -3 , Na 2 CO 3 concentration of 10 mol m -3, temperature of 333 K and O 2 concentration of 4 %, which were determined by an orthogonal experiment. Under these optimal conditions, it was possible for the absorption rate to reach up to 1.9271 · 10 -5 mol/(s m 2 ).

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Removal of NO from flue gases by absorption to an iron(ii) thiochelate complex and subsequent reduction to ammonia

Cited by 123 publications

References 15 publications

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Performance characteristics of NO removal by cobalt diethylenetriamine solution

Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions

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Removal of NO from flue gases by absorption to an iron(ii) thiochelate complex and subsequent reduction to ammonia

Cited by 123 publications

References 15 publications

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Iron chelates bind nitric oxide and decrease mortality in an experimental model of septic shock.

Performance characteristics of NO removal by cobalt diethylenetriamine solution

Absorption of NO in Aqueous NaClO2/Na2CO3 Solutions

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Absorption of NO in Aqueous NaClO₂/Na₂CO₃ Solutions