Metal carbonyls nitric oxide, reaction with

The bluish white, hard, yet ductile, metal is inert to all acids and highly non-abrasive. Used for heavy-duty parts in electrical contacts and spinning jets. Reflectors are prepared from the mirror-smooth surfaces (e.g. head mirrors in medicine). Thin coatings provide a corrosion-resistant protective layer, for example, for jewelry, watches, and spectacle frames. The metal is a constituent of three-way catalysts. Rhodium complexes are used with great success in carbonylations (reactions with CO) and oxidations (nitric acid) in industry. Platinum-rhodium alloys are suitable thermocouples. 

The use of nitrite (NO ) as a source of metal nitrosyls is now well established as discussed in Section II,A3. One study of the reaction of PPN(N02) with carbonyl clusters of the Co triad revealed an alternative synthesis of [Co6N(CO)i5] and [Rh6N(CO)i5] "(i5). As shown in Eqs. (48) and (49), both the tetranuclear and hexanuclear starting materials for Rh lead to the same nitrido cluster. The reasonable yields for Rh by either route suggest that the product is somewhat of a thermodynamic sink. Consistent with this idea, Eq. (50) shows the use of gaseous nitric oxide itself to form the Rh nitrido cluster directly (J). 

TETROXIDO de NITOGENO (Spanish) (10544-72-6) Noncombustible, but supports combustion of combustible materials. A powerful oxidizer. Water contact produces nitric acid and nitric oxide. Incompatible with nitric oxide reacts with air, producing additional nitrogen tetroxide. Violent reaction with strong reducing agents, anhydrous ammonia, alcohols, barium oxide, boron trichloride, carbon disulfide, chlorinated hydrocarbons, cyclohexane, difluoro-trifluoromethylphosphine, dimethyl sulfoxide, formaldehyde, ethers, fluorine, formaldehyde, halocarbons, hydrocarbons, metal acetylides, metal carbides, metal powders, metal carbonyls. 

High reaction temperatures in catalytic processes can lead to loss of active components by evaporation. This does not only occur with compounds that are known to be volatile (e. g., P2O5 in H3PO4, silica gel, HgCl2/activated carbon), but also by reaction of metals to give volatile oxides, chlorides, or carbonyls. In the oxidation of ammonia on Pt/Rh net catalysts (Ostwald nitric acid process), the catalyst reacts with the gas phase to form volatile Pt02- Furthermore, porous platinum growths are observed on the surface. This can be prevented by addition of rare earth oxides. 

Since during the Purex process TBP, alkane, and aqueous nitric acid solution are in mixture or contact condition, the radiation chemical transformations depend on the composition, concentration of nitric acid, contaminant metal ions, irradiation conditions, and oxygen concentration (Triphathi and Ramanujam 2003 Katsumura 2004). Under aerated condition, the organic radicals react with oxygen forming peroxy radicals. After successive reactions a variety of alcohols, ketones, peroxides, and carbonyl compounds form. The ratio of nitration products to oxidation products is 0.8, and the ratio increases if there is no sufficient supply of O2. 

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