THE REACTIONS OF METAL OXIDES WITH CR()aq,
Abstract
When Cr(ACTS WITH MnO2, PbO2, Tl2O3, Mn2O3, Co2O3, or CeO2, Cr(OH2)6(3) is in each case the predominant form of the Cr(III) product. When the oxidizing agent has a higher ratio of O (-)/Pb(IV), as when Pb3O4 or Ca2PbO4 reacts, the Cr(III) 'dimer' (or a higher polymer) is formed. No oxygen transfer from PbO2 to Cr occurs in the oxidation reduction process, but some does occur when MnO2, Tl2O3 or Mn2O3 react. The oxides containing metal ions which undergo 2e(-) changes (MnO2, PbO2, Tl2O3) react much more rapidly than those having metal ions which undergo le(-) changes. When MnO2 is the oxidiz ing agent, and when the concentration of Cr() is low, a remarkable deviation from the stoichio metry described above is observed. Under these conditions ClO4(-) is reduced by Cr() despite the fact that the reaction of MnO2 with Cr(). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 02, 1963
- Accession Number
- AD0426959
Entities
People
- B.a. Zabin
- Henry Taube
Organizations
- Stanford University