Method for continuously preparing metal oxides catalyst and apparatus thereof
US9012351B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2009 |
| Grant date | Apr 21, 2015 |
| Priority date | — |
| Expiry date | Feb 10, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for continuously preparing a metal oxides catalyst comprises the following steps: dissolving metal materials using nitric acid solution to produce a metal nitrate solution, and also to produce NOx and water vapor; hydrolyzing the metal nitrate solution by introducing pressurized superheated water vapor into the metal nitrate solution to obtain a slurry of the hydrates of metal oxides as well as acidic gas, the main components of the acidic gas are NO2, NO, O2 and water vapor; filtrating and drying the slurry to obtain the hydrates of metal oxides and/or metal oxides; and then utilizing the obtained hydrates of metal oxides and/or metal oxides as raw materials and preparing the metal oxides catalyst by the conventional method for preparing a catalyst. The NOx gas produced can be absorbed to produce nitric acid which can be reused. An apparatus used for preparing metal oxides comprises a metal salt solution preparation system, a metal salt solution hydrolysis system, a product preparation system and a nitric acid preparation and recycling use system. The method and the apparatus can achieve continuous production, enclosed circulation and zero release in the whole process and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.