Patent · US Expired

Catalyst body and process for breaking down nitrogen oxides

US6569394B2 · kind B2 · utility

32Cited by

10References

7Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Stefan Fischer · Lichtenfels, DE
Gunther Pajonk · Zapfendorf, DE
Frank Witzel · Saratoga Springs, US

Key dates

Filing date	May 25, 2001
Grant date	May 27, 2003
Priority date	—
Expiry date	Nov 2, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A gas stream that contains nitrogen oxides is passed, in the presence of a reducing agent, over a catalyst body with an active material that contains a zeolite and titanium dioxide. The zeolite is a hydrogen-ion-exchanged, acid zeolite. Even at temperatures above 450° C., the nitrogen oxides contained are still effectively converted into nitrogen and water.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.