Urea decomposition, with nickel nitrate

FIGURE 28 Metal concentration profiles along the length of a monolith for deposition precipitation by use of urea decomposition with nickel nitrate on a cordierite monolith. Metal deposited on a 25-cm-long, 1-cm-diameter, 400 cpsi monolith. Profiles were determined by X-ray fluorescence spectroscopy of finely ground 2.5-cm long sections of the monolith. 

The incipient wetness catalyst was prepared with an aqueous solution of Ni(N03)2.6 H2O added slowly to the support (Silica Ketjen 77, 270 m g" ). The solution concentration was adjusted to obtain catalysts with ca. 10% nickel content. The precipitation-deposition catalyst was prepared by precipitating nickel from an aqueous solution of nickel nitrate slurried with the support. The precipitation was produced by a slow and homogeneous change in the pH induced by urea thermal decomposition. 

NITROCARBOL (75-52-5) Forms explosive mixture with air (flash point 95°F/35°C). Thermally unstable. Shock, friction, pressure, or elevated temperature above 599°F/315°C can cause explosive decomposition, especially if confined. Violent reaction with strong oxidizers, alkyl metal halides, diethylaluminum bromide, formic acid, methylzinc iodide. Contact with acids, bases, acetone, aluminum powder, amines, bis(2-aminoethyl)amine, haolforms make this material more sensitive to explosion. Reacts, possibly violently, with ammonium hydroxide, calcium hydroxide, calcium hypochlorite, 1,2-diaminomethane, formaldehyde, hexamethylbenzene, hydrocarbons, hydroxides, lithium perchlorite, m-methyl aniline, nickel peroxide, nitric acid, metal oxides, potassium hydride, potassium hydroxide, sodium hydride. Mixtures with ammonia, aniline, diethylenetriamine, metal oxides, methyl amine, morpholine, phosphoric acid, silver nitrate form shock-sensitive compounds. Forms high-explosive compound with urea perchlorate. Mixtures with hydrocarbons and other combustible materials can cause fire and explosions. Attacks some plastics, rubber, and coatings. 

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