Method for treating a gas containing nitrogen oxides (NOx) using a composition comprising zirconium, cerium and niobium as a catalyst
US9011806B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Feb 28, 2012 |
| Grant date | Apr 21, 2015 |
| Priority date | — |
| Expiry date | Feb 28, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a method for treating a gas containing nitrogen oxides (NOx), in which an NOx-reduction reaction is carried out using a nitrogen-containing reducing agent, which invention is characterized in that the catalyst used for the reduction reaction is a catalytic system containing a composition comprising zirconium, cerium and niobium in the following percentages by weight, expressed in terms of the weight of oxide: 10-50% of cerium, 5-20% of niobium and the remainder consisting of zirconium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.