Denitration catalyst and denitrating method
US4466947A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 7, 1983 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | Jan 7, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/20776
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A denitration catalyst comprising at least three metal components, (A) titanium, (B) tungsten and/or magnesium, and (C) vanadium, the titanium and tungsten being contained as oxides and the magnesium and vanadium being contained in the form of an oxide or a sulfate or both, said catalyst being composed of a porous molded article of a mixture of an oxide of component A and an oxide and/or a sulfate of component B, the atomic ratio of component B to component A being from 0.01 to 1, and a vanadium compound localized in that area of said molded article which extends from its outermost surface to a depth of 500 microns or less, the content of the vanadium compound in said area being 0.1 to 15% by weight; and a method for removing nitrogen oxides from a waste gas, which comprises contacting a waste gas containing nitrogen oxides, together with ammonia and molecular oxygen, at a temperature of 150.degree. to 650.degree. C., with the aforesaid catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.