Rare earth alumina particulate manufacturing method and application
US8629077B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Aug 29, 2007 |
| Grant date | Jan 14, 2014 |
| Priority date | — |
| Expiry date | Aug 29, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/17
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A rare earth alumina particulate composition manufacturing method and application are disclosed. The rare earth alumina of the invention is a particulate of porous structure with a molecular formula (REx,Al1-x)2O3, phase γ or γ+δ characterized by a particle size distribution ranging from 1 to 80 μm with a D50 of 5 to 15 μm, a pore size distribution ranging from 0.4-200 nm with an average pore diameter of 8 to 30 nm, a pore volume (PV) raging from 0.5 to 1.2 cc/g and a fresh specific surface area (SA) ranging from 130 to 250 m2/g after calcination at 500-900° C. for 5 to 10 hours. The rare earth alumina retains a SA of greater than 60 m2/g after calcination at 1200° C. for 4 hours and greater than 40 m2/g after calcination at 1200° C. for 50 hours. There is no presence of the α phase or other impurity phases in the long-term aged samples. The rare earth alumina of the invention has a high thermal stability and is a fine three-way catalyst support material. The rare earth alumina is made using wet continuous coprecipitation with a static mixer and a tank reactor featuring simple operation, low cost and high feasibility in industrial production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.