Oxidation catalyst
Abstract
Abstract A class of ceramic mixed oxide, nonstoichiometric electrically neutral, rare-earth-type catalyst containing rare-earth-type elements, elements of the first transition metal series and Zirconium, Tin or Thorium and optionally the alkaline earth metals. The catalyst has the following formula: W.sub.k X.sub.n Y.sub.(1-k-n) ZO.sub.(3.sub.+-m.sub.') (I) wherein: W is Zirconium, Tin or Thorium or mixture thereof; X is an alkaline earth metal or mixture thereof; J is a rare-earth-type element or mixture thereof; Z is a metal of the first transition series or a mixture thereof, at least 0.01% of said metal having an oxidation state other than +3; k is a number having a value of between 0 and about 0.1; m' is a number having a value of from 0 to about 0.26, provided m has a value other than 0 when n has a value of 0; and n is a number having a value from 0 to about 0.51, provided when n has a value of 0, k has a value of between 0 and about 0.05.
Inventors
- 👤 James M. Whelan
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |