Group 16 elements hydrogen sulfide

At room temperature bismuthine rapidly decomposes into its elements. The rate of decomposition increases markedly at higher temperatures (8). Bismuthine decomposes when bubbled through silver nitrate or alkafl solutions but is unaffected by light, hydrogen sulfide, or 4 sulfuric acid solution. There is no evidence for the formation of BiH, though the phenyl derivative, (C H BU, is known. The existence of BiH would not be anticipated on the basis of the trend found with other Group 15 (V) "onium" ions. 

Very little is known about chalcogenide halides of Group IVB elements. Although the existence of sulfide chlorides (45, 274, 329, 365) and of a selenide chloride (329) of titanium was claimed in early publications, their true composition, and even their existence, remains doubtful. They have usually been obtained by the reaction of titanium chlorides with sulfur and selenium, respectively, or with hydrogen sulfide. The synthesis of a pure compound, TiSClj, was published in 1959 (113). It is an intermediate of the reaction of TiCU with HjS. 

The two primary approaches to removal of sulfurous compounds from process gas streams are 1) the direct-oxidation processes and 2) the acid-gas removal systems9,10. in the direct-oxidation processes, hydrogen sulfide is selectively removed from the process gas, and the sulfur is recovered in its elemental form. The acid-gas removal processes, as a group, remove acidic components (H2S, CO2, HCN, etc.) and regenerate these species into a separate side stream. 

Sulfur is a typical representative of the group of active outgassed elements. Sulfur dioxide (SO2) and hydrogen sulfide (H2S) are of common occurrence among the gaseous sulfur compounds evolved with volcanic gases. 

Sulfur reacts directly with hydrogen but the position of the equilibrium at normal temperatures precludes its use as a preparative method for hydrogen sulfide. The element bums readily in oxygen with a characteristic blue flame to form sulfur(IV) oxide (SO2) and traces of sulfur(VI) oxide (SO3). Sulfur also forms a large number of oxy-acid species, some containing peroxy-groups and some with two or more S-atoms. It forms four distinct fluorides,... 

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