Reduction of sulfates by hydrogen
- 1 December 1976
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 54 (23) , 3646-3650
- https://doi.org/10.1139/v76-524
Abstract
The initial stage of reduction of anhydrous sulfates by H2 may lead to the formation of any of the following: (1) sulfates at lower valency, e.g., reduction of CuSO4, HgSO4, Fe2(SO4)3; (2) metals, e.g., Cu2SO4, Ag2SO4; (3) sulfides, e.g., NiSO4, CoSO4, CdSO4, CaSO4, SrSO4, BaSO4, and alkaline metal sulfates; (4) oxides, e.g., Al2(SO4)3, MgSO4, BeSO4; (5) a mixture of oxide and sulfide, e.g., FeSO4, MnSO4, ZnSO4, PbSO4. While CuSO4, Ag2SO4, and PbSO4 are the only sulfates that yield metals on reduction, CuSO4 is the most interesting because it yields the metal at 350 °C. PbSO4 is reduced to metal at about 800 °C, and Ag2SO4 already yields the metal by thermal decomposition above 800 °C.Keywords
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