Metal-oxygen-sulfur systems

Figure 15.17 Stability diagrams for the systems (a) metal (M)-sulfur-oxygen (idealized), (b) Cu-S-O and (c) Pb S-O.

Figure 4.3 A stability diagram for a metal (M) -sulfur (S) - oxygen (O) system at a fixed temperature.

Here the discussion will be limited to heterometallic systems in which the metal is linked to nitrogen, oxygen, sulfur and phosphorus donor atoms predominantly. Ligand reactions range from some very simple and almost trivial examples to complicated and sophisticated processes involving many steps. The coverage in this essay will be selective and will depend upon the type of reaction mechanisms either known to occur or reasonably supposed to take place. 

Answer 3.6 As with V2O5 in the Contact process for making sulfuric acid, the ability of cerium to adopt transition-metal-like behaviour in switching oxidation states means that the cerium oxide can effectively act as an oxygen-storage system. 

The oxygen-sulfur interchange reaction was extended to an acyclic anhydride system. High conversion of acetic anhydride to a mixture of thioacetic acid and acetic acid was obtained employing alkali metal... 

Oxidation of elastomers is accelerated by a number of factors including heat, heavy metal contamination, sulfur, light, moisture, swelling in oil and solvents, dynamic fatigue, oxygen, and ozone. Three variables in the compound formulation can be optimized to resist degradation polymer type, cure system,... 

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