High surface area oxide compositions with a pyrochlore structure, methods for their preparation, and conversion processes utilizing same
US5105053A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1991 |
| Grant date | Apr 14, 1992 |
| Priority date | — |
| Expiry date | Jan 2, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2523/18
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Processes for the conversion of hydrocarbons, and most preferably methane, to higher hydrocarbons and olefins are disclosed, including contacting the hydrocarbons with a mixed metal oxide catalyst having the pyrochlore structure. Preferably, these catalysts have the general formula A.sub.n B.sub.2 O.sub.7-x, where A can be various mono-, di-, and trivalent metal cations, B can be various tri-, tetra-, penta-, and hexavalent metal cations, 0.ltoreq.n.ltoreq.2.0, and 0.ltoreq.x.ltoreq.1.0. Novel, high surface area, mixed metal oxide catalysts having the pyrochlore structure are also disclosed, including those having the formula A.sub.2 B.sub.2 O.sub.7, where A is divalent and B is niobium and/or tantalum, and those having the formula A.sub.2 (Sn.sub.2-y A.sub.y)O.sub.7-z, where A is bismuth and/or lead, 0.0.ltoreq.y.ltoreq.1.0, and 0.0.ltoreq.z.ltoreq.1.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.