Publication number: 20080256934
Abstract: A catalyst unit (1; 1?) configured for the reduction of NOx compounds in a gas stream and which includes a catalytically active material of the silver/alumina type. The catalyst unit (1; 1?) has at least one first reaction zone (3a, 3b, 3c, 3d, 3e) containing the catalytically active material and at least one second reaction zone (4a, 4b, 4c, 4d, 4e; 8a, 8b, 8c, 8d, 8e) which is arranged to permit breakdown of a gas species which is formed in the first reaction zone (3a, 3b, 3c, 3d, 3e), with N2 being formed, and in that the gas stream is conducted through the first reaction zone (3a, 3b, 3c, 3d, 3e) and the second reaction zone (4a, 4b, 4c, 4d, 4e; 8a, 8b, 8c, 8d, 8e). The invention results in an improved catalyst unit which in particular provides high-grade reduction of NOx compounds in an exhaust gas stream from a combustion engine.
Type:
Application
Filed:
May 27, 2005
Publication date:
October 23, 2008
Applicant:
VOLVO TECHNOLOGY CORPORATION
Inventors:
Kari ERANEN, Edward Jobson, Lennart Cider, Lars-Eric Lindfors