Use of high surface area mixed metal oxides of manganese and calcium in electrochemical processes
US4101716A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1977 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Aug 15, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Mixed metal oxides of the formula CaMn.sub.3 O.sub.6, CaMn.sub.4 O.sub.8 and CaMn.sub.7 O.sub.12 are disclosed. They are useful in electrochemical processes. CaMn.sub.3 O.sub.6 is a mixed valence composition whose formula may be written as Ca[Mn.sub.2.sup.3+ Mn.sup.4+ ]O.sub.6. The compound is stable in H.sub.2 to about 400.degree. C. and in oxygen to approximately 925.degree. C. CaMn.sub.4 O.sub.8 is also a mixed valence composition whose formula may be written Ca[Mn.sub.2.sup.3+ Mn.sub.2.sup.4+ ]O.sub.8. This compound is stable in H.sub.2 to about 250.degree. C. and in O.sub.2 to about 900.degree. C. CaMn.sub.7 O.sub.12 is a mixed valence composition whose formula may be written as Ca[Mn.sup.4+ Mn.sub.6.sup.3+ ]O.sub.12. The compound is stable in H.sub.2 to about 500.degree. C. and in oxygen to approximately 950.degree. C. These materials may be prepared by a variety of standard ceramic techniques, among them being heating in oxygen a mixture of calcium oxide and manganese oxide or mixed calcium and manganese salts or calcium salt and manganese oxide, or calcium oxide and manganese salt. Alternatively, solid solutions of mixed calcium and manganese carbonates may be decomposed to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.