Nitrous chemical decomposition

Q. Zhu, R. M. van Teeffelen, R. A van Santen, and E. J. M. Hensen, Effect of high-temperature treatment on Fe/ZSM-5 prepared by chemical vapor deposition of FeCls 11. Nitrous oxide decomposition, selective oxidation of benzene to phenol, selective reduction of nitrous oxide by MO-butane, J. Catal. 221, 575—583 (2004)... 

EXPLOSION and FIRE CONCERNS combustible solid volatile with steam NFPA rating Health 2, Flammability 1, Reactivity 0 sublimes evolves a vapor that is flammable and explosive at elevated temperatures incompatible with nitrous acid decomposition liberates toxic fumes of oxides of nitrogen use carbon dioxide or dry chemical for firefighting purposes. 

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],... 

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. ... 

Its chemical stability is fairly high and only an insignificant amount decomposes on prolonged boiling in water. Boiling in dilute sulphuric acid causes decomposition with the evolution of nitrous oxide, acetaldehyde and ethylene glycol. 

In addition to the three main types of reaction involved in nitrocellulose decomposition, the author assumes that secondary reactions also occur originating in the chemical combination between oxides of nitrogen and water vapour to produce nitric and nitrous acids, which in turn react with the nitrocellulose. By heating nitrocotton with dilute nitric acid at 40°C, Desmaroux found in this instance that hydrolytic and oxidation reactions predominate, causing a weight loss of +-J of the total loss (see Table 67). 

C. Meiner, Recherches sur la decomposition thermique du protoxyde et de Voxyde d azote, Genfeve, 1926 J. Wiswald, Contribution d I etude de la recuperation des gaz nitreux, Genfeve, 1921 H. Davy, Researches Chemical and Philosophical chiefly concerning Nitrous Oxide or Dephlogisticated Nitrous Air, and its Respiration, London, 1800 H. B. Baker, Journ. Ohem. Soc., 65. 611, 1894 Ohem. News, 69. 270, 1894 F. Forster and A. Blich, Zeit. angew. Ohem., 28. 2017, 1910 F. Haber and W. Holwech, Zeit. Elektrochem., 16. 810, 1910. 

DOT CLASSIFICATION 6.1 Label KEEP AWAY FROM FOOD SAFETY PROFILE Confirmed carcinogen with experimental tumorigenic data. Along with p-naphthylamine and benzidine, it has been incriminated as a cause of urinary bladder cancer. Poison by subcutaneous and intraperitoneal routes. Moderately toxic by ingestion. Mutation data reported. Combustible when exposed to heat or flame. Incompatible with nitrous acid. To fight fire, use dry chemical, CO2, mist, spray. When heated to decomposition it emits toxic fumes of NOx. See also 2-NAPHTHYLAMINE and AROMATIC AMINES. 

Combustible when exposed to heat or flame can react with oxidizing materials. To fight fire, use water, CO2, dry chemical. Potentially explosive reaction with concentrated nitric acid. Incompatible with acetanilide, alkalies, ferric salts, spirit nitrous ether, urethan. When heated to decomposition it emits acrid smoke and irritating fumes. 

Catalytic decomposition can be considered the simplest removal method for N2O because it does not need any additional chemical compounds. The catalytic decomposition of nitrous oxide is highly exothermic (—19.6kcalmol ) ... 

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