Nitrous oxide reactivity

Nitric oxide, 323-326 Nitrogen bonds, 182 hybridization, 188 liquid, 232 reactivity, 555-556 solubility, 267 Nitrogen dioxide, 563 Nitrogen gas, 124 Nitrous acid, 365-366,567 Nitrous oxide, 565... 

Despite several decades of studies devoted to the characterization of Fe-ZSM-5 zeolite materials, the nature of the active sites in N20 direct decomposition (Fe species nuclearity, coordination, etc.) is still a matter of debate [1], The difficulty in understanding the Fe-ZSM-5 reactivity justifies a quantum chemical approach. Apart from mononuclear models which have been extensively investigated [2-5], there are very few results on binuclear iron sites in Fe-ZSM-5 [6-8], These DFT studies are essentially devoted to the investigation of oxygen-bridged binuclear iron structures [Fe-0-Fe]2+, while [FeII(p-0)(p-0H)FeII]+ di-iron core species have been proposed to be the active species from spectroscopic results [9]. We thus performed DFT based calculations to study the reactivity of these species exchanged in ZSM-5 zeolite and considered the whole nitrous oxide catalytic decomposition cycle [10],... 

The decomposition of nitrous oxide over various metal oxides has been widely investigated by many investigators (1-3). Dell, Stone and Tiley (4) have compared the reactivity of metal oxides and shown that in general p-type oxides were the best catalysts and n-type the worst, with insulators occupying an intermediate position. It has been generally accepted (5) that this correlation indicates that the electronic structure of the catalyst is an important factor in the mechanism of the decomposition of nitrous oxide over metal oxides catalysts. The reaction is usually written (4) as... 

Nitrous oxide (N2O) is an important greenhonse gas with a radiative forcing effect 310 times that of CO2 and a lifetime in the troposphere of approximately 120 years. Part of the N2O is converted to NO in the stratosphere, and so contributes to depletion of ozone. Nitric oxide (NO) is very reactive in the atmosphere and has a lifetime of only 1-10 days. It contribntes to acidification and to reactions leading to the formation of ozone in the troposphere, and so also to global warming. 

A reactive intermediate may be responsible for the copper catalysis of the hydroxylamine reaction. The intermediate formed in the silver-catalyzed reaction, if it has any real existence, is not further oxidized but breaks down into nitrogen and water. Oxidation of hydroxylamine by cupric ion, on the other hand, yields predominately nitrous oxide. The intermediate formed by the removal of a single electron from the hydroxylamine in this reaction must be further oxidized to yield the final product. Such an intermediate may react readily with silver ions in solution. 

Reactive extraction of lignin from red spruce has been studied using supercritical methylamine and methyla-mine-nitrous oxide binary mixtures. The wood residues and precipitated fractions after extractions have been characterized by chemical and spectroscopic procedures. 

Nitramine has explosive properties but it is not of any practical value for many reasons, primarily because of its high reactivity which impairs its chemical stability. It decomposes at a temperature as low as its melting point. At room temperature it decomposes slowly, to form nitrous oxide and water. On heating to 60-65°C decomposition occurs in an aqueous solution. It decomposes explosively on contact with concentrated sulphuric acid. ... 

The relative reactivities of various substances toward mercury triplets are expressed as quenching cross sections. These have been determined both by measuring the efficiency of quenching the 2537 A mercury phosphorescence494 and by Cvetanovic s chemical method employing nitrous oxide.495 In general, quenching cross sections are... 

HYPONITROUS ACID AND HYPONITRITES. Hyponitrous acid H N 0 is a while solid, explosive even at as low a temperature as CFC. soluble in water, more soluble in ether, can thus be extracied from water solution bv ether and the latter evaporated, water solution decomposes quickly into nitrous oxide plus water, Hyponitrous acid is nonreactive with hydriodic avid fa strong reducing agent), but reactive with permanganic acid (a strong oxidizing agent) to form nitrous or nitric acid. 

Oxenium Ions. Oxenium ions similar to nitronium ions are, in general, too reactive to be observed. The parent ion—that is, the hydroxyl cation HO+—is elusive, and it is improbable that it can be observed in its free form in the condensed state. However, the incipient hydroxyl cation is involved in acid-catalyzed electrophilic hydroxylation with protonated (or Lewis acid complexed) hydrogen peroxide (HO—OH2+) or ozone (HO—O—0+).125 Nitrous oxide is also apotential precursor for the hydroxyl cation (in its protonated form). The hydroxy diazonium ion HON2+ has not yet been observed. 

The amounts of acetaldehyde produced approached a maximum with time and the amounts of nitrous oxide also decreased with the % conversion. Since carbon monoxide, carbon dioxide, and methanol increased with time, it seems likely that, parallel to the role of formaldehyde in azomethane oxidation, acetaldehyde was a reactive intermediate. Acetaldehyde removed by such a reaction as... 

The anesthetic nitrous oxide (N2O) inhibits MetH by reacting with cob(l)alamin, which probably yields reactive hydroxyl radicals that damage the MetH protein (25). Model studies have shown that N2O reacts with cob(I)alamin, but not... 

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