Nitric oxides reductive elimination

The Inventa-NO process is similar to the BASF process in that the first source of by-product ammonium sulfate is eliminated. Like the BASF process the Inventa process prepares hydroxylamine sulfate by the reduction of nitric oxide with hydrogen over a noble metal catalyst suspended in sulfuric acid. The differences between the BASF and Inventa processes are ... 

Reaction of nitric oxide with high oxidation state metal halides can lead to reduction to low-valent nitrosyl compounds, with elimination of nitrosyl halide. This route has been used particularly for early transition metal compounds and some examples from molybdenum chemis-... 

A feature of the radiolysis experiments which requires some additional clarification concerns the ethylene product. One might object to the omission of any contribution from radical reactions to the ethylene product since radical scavengers affect the yield of this unsaturate. Thus, oxygen sharply reduces the ethylene product while nitric oxide has a less pronounced effect. However, since both scavengers have identical effects on all the rest of the products in the system, we are inclined to interpret the reduction of ethylene in the presence of these additives to quenching of the excited state of the ethyl chloride molecule which eliminates HC1. It has been supposed for some time that oxygen efficiently quenches certain excited states hence, this suggestion does not seem unreasonable. 

The metabolism of nitroprusside by smooth muscle is initiated by its reduction, followed by the release of cyanide and then nitric oxide. Cyanide is further metabolized by liver rhodanase to thiocyanate, which is eliminated almost entirely in the urine. The mean elimination half-time for thiocyanate is 3 days in patients with normal renal function but can be much longer in patients with renal insufficiency. 

First NO is formed and then it is oxidized in the atmosphere to NOj. Since in combustion, the origin of nitrogen is not only from N-rich fuel but also from air supphed for oxidation, in the elimination of NO, postcombustion methods are important. So far the most effective technique has been selective catalytic reduction of NO . on various catalysts. When the activated carbons are used as removal media, the elimination process includes also adsorption combined either with oxidation or reduction. Oxidation usually leads to the formation of nitric acid whereas Nj is the product of NO, reduction. As in the cases of other pollutants addressed in this review, for NO, removal either unmodified or impregnated (caustics, catalytic metals) activated carbons have been used [101-114]. 

Pu, Zr(+Nb), and Ce and iTithenlum complexes. Neptunium, plutonium, and cerium are made less extractable by reduction to lower oxidation states. Favorable separation of tiranlum from the other elements may be achieved by control.of the nitric acid and saltlng-out agent concentrations. Free halogens are extracted. These elements may be eliminated from solution prior to uranliim extraction. The halogens also combine chemically with a number of solvents eg,. 

A simple, rapid method for the determination of uranium In Impire aqueous solutions was developed. Uranlum(Vl) Is extracted by 0.l l trl-n-octylphosphlne oxide In cyclohexane from a nitric acid solution. A yellow color Is formed In an aliquot of the organic extract by addition of dlbenzoylmethane and pyridine In ethyl alcohol. Interference by cations Is minimized or eliminated by selective reduction, by fluoride oomplexatlon, or by absorbance measurement at 4l6 mii rather than 405 mii, the wave length of maximum absorbance. Interference by excess fluoride or phosphate Is eliminated by addition of alumlnxun nitrate before extraction. 

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