Dinitrogen with various metals

The roles of alkali, alkali earth and rare earth metal oxides seem different from the structural promoters. These oxides are able to increase the specific activity per unit surface area, while decrease the heat-resisting and anti-toxic ability. Thus, they are called as electronic promoters. Because the diameter of K+ ions is quite large, it is not possibly for K to enter into the lattice of magnetite. After reduction, K2O diffuses to the surface of crystallite. The surface potassium is able to accumulate with various forms during reduction and operations, to accelerate the recrystallization effect, but due to the electron, negative alkali metals decrease the effusion work of iron atoms, and accelerate the adsorption of dinitrogen or desorption of ammonia and finally are able to increase the specific activity per unit surface area. 

Mixtures of aluminium powder with liquid chlorine, dinitrogen tetraoxide or tetran-itromethane are detonable explosives, but not as powerful as aluminium-liquid oxygen mixtures, some of which exceed TNT in effect by a factor of 3 to 4 [1], Mixtures of the powdered metal and various bromates may explode on impact, heating or friction. Iodates and chlorates act similarly [2], Detonation properties of gelled slurries of aluminium powder in aqueous nitrate or perchlorate salt solutions have been studied [3], Reactions of aluminium powder with potassium chlorate or potassium perchlorate have been studied by thermal analysis [4],... 

By single electron transfer from an electron donor, e.g. a transition metal ion, a trivalent phosphorous derivative or a base, followed by dissociation of the intermediate diazenyl radical in an aryl radical and dinitrogen. The aryl radical reacts with the solvent or with added reagents in various ways, as shown by the relatively large number of classical named reactions (Sandmeyer, Pschorr, Gomberg-Bachmann, Meerwein reactions). 

Dinitrogen bound to early transition metals in various ways, such as in [ TaCl3(THF)2 2N2], f (r 5-C5Me5)2Zr(N2) 2N2], and [(p5-C6H5)2Zr(7 2-N2) CH(SiMe3)2 ], yields hydrazine upon protonation with acids. The mechanisms are generally unknown, but the intermediacy of hydra-zido(2-) species cannot be excluded. 

Nitrite Reductase. Bacterial denitrification in anaerobic microorganisms involves a four-step process, with the overall reduction of nitrate (N03 ) to dinitrogen (N2). Each reaction in the reduction process is catalyzed by one or more different metalloenzymes, which have various transition metals found in diverse ligand environments nitrate reductase (NOR, molybdenum), nitrite reductase (NiR, iron or copper), nitric oxide reductase (NOR, heme and nonheme iron), and nitrous oxide reductase (N2OR, copper) (9). 

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