Patent · US Expired

Process of catalytically reducing NO

US4950139A · kind A · utility

6Cited by

2References

4Claims

0Family size

Assignee

Metallgesellschaft AG · DE

Inventors

Wolfgang Fennemann · Karben, DE
Werner Weisweiler · Remchingen, DE
Burkhard Retzlaff · Karlsruhe, DE
Bernd HOCHSTEIN · Karlsruhe, DE

Key dates

Filing date	Jan 17, 1989
Grant date	Aug 21, 1990
Priority date	—
Expiry date	Jan 17, 2009

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01J27/053
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process is disclosed wherein NO contained in a gas is reduced by means of NH.sub.3 as a reducing agent. A mixture of the NO-containing gas and NH.sub.3 is reacted at 290.degree. to 450.degree. C. in the presence of a catalyst, which comprises a support of SiO.sub.2 and contains 5 to 15% by weight manganese sulfate and iron sulfate. The mole ratio of manganese sulfate and iron sulfate, which is calculated as FeSO.sub.4, is between 1:10 and 10:1. The support has a pore volume of 0.6 to 1.6 ml/g and an average pore diameter of 10 to 100 nm.

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