Amorphous perovskite catalysts for nitrogen oxide reduction and methods of preparing the same
US5691263A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1996 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Aug 28, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S502/525
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The amorphous perovskite structure catalysts according to the present invention comprise a carrier material and a mixture of at least two metal oxides supported thereon, which have the following formula: EQU (M.sup.1.sub.a O.sub.x.M.sup.2.sub.1-a O.sub.y)(M.sup.3.sub.b O.sub.z.M.sup.4.sub.1-b O.sub.w)/S wherein M.sup.1 and M.sup.2 independently of each other are selected from the group consisting of the lanthanide metals, the alkali metals and the alkaline earth metals, M.sup.3 and M.sup.4 independently of each other are selected from the group consisting of the transition metals and the platinum metals, a and b are from 0 to 1, x, y, z and w are determined stoichiometrically on the values of a and b, the ratio of M.sup.1 +M.sup.2 ! to M.sup.3 +M.sup.4 ! is 0.1.about.3.0:1.0, and S is a carrier material. The process for preparing the amorphous perovskite structure catalysts comprises dissolving completely at least two salt solutions of metals, M.sup.1, M.sup.2, M.sup.3 and M.sup.4, and an acid in an organic acid, preparing an ester type resin intermediate by adding a hydroxy alcohol to the solution, mixing the solution in a liquid state by adding a powder type carrier material, dis…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.