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Nickel carbonyl (IUPAC name: tetracarbonylnickel) is a nickel(0) organometallic compound with the formula Ni(CO) 4.This colorless liquid is the principal carbonyl of nickel.It is an intermediate in the Mond process for producing very high-purity nickel and a reagent in organometallic chemistry, although the Mond Process has fallen out of common usage due to the health hazards in working with ...
As for many metal chalcogenides, the phase diagram for nickel(II) selenide is complicated. Two other selenides of nickel are known, NiSe 2 with a pyrite structure, and Ni 2 Se 3. Additionally, NiSe is usually nonstoichiometric and is often described with the formula Ni 1−x Se, with 0 < x < 0.15. [1]
NiO(s) + H 2 (g) → Ni(s) + H 2 O(g) 2. The impure nickel reacts with carbon monoxide at 50–60 °C to form the gas nickel carbonyl, leaving the impurities as solids. Ni(s) + 4 CO(g) → Ni(CO) 4 (g) 3. The mixture of nickel carbonyl and syngas is heated to 220–250 °C, resulting in decomposition back to nickel and carbon monoxide:
The phase diagram shows, in pressure–temperature space, the lines of equilibrium or phase boundaries between the three phases of solid, liquid, and gas. The curves on the phase diagram show the points where the free energy (and other derived properties) becomes non-analytic: their derivatives with respect to the coordinates (temperature and ...
Nickel tetracarbonyl (Ni(CO) 4), discovered by Ludwig Mond, [43] is a volatile, highly toxic liquid at room temperature. On heating, the complex decomposes back to nickel and carbon monoxide: Ni(CO) 4 ⇌ Ni + 4 CO. This behavior is exploited in the Mond process for purifying nickel, as described above.
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