The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2025
Filed:
Apr. 17, 2023
Johnson Matthey Public Limited Company, London, GB;
Daniel Avis, Royston, GB;
Rafal Baran, Reading, GB;
Gavin Brown, Royston, GB;
Alexander Green, Royston, GB;
Neil Greenham, Royston, GB;
Matthew Harris, Royston, GB;
Oliver Hemming, Billingham, GB;
Carmelo Iacono, Reading, GB;
Caitlin Jenkins, Reading, GB;
Alanna Murphy, Royston, GB;
Paul Phillips, Royston, GB;
Johnson Matthey Public Limited Company, London, GB;
Abstract
A method of treating exhaust gas from a lean burn internal combustion engine is disclosed. The method comprises: introducing ammonia or an ammonia precursor into the exhaust gas upstream of an Fe-SCR catalyst, the Fe-SCR catalyst comprising iron and a zeolite; and contacting the exhaust gas with the Fe-SCR catalyst; wherein the amount of ammonia or ammonia precursor introduced into the exhaust gas upstream of the Fe-SCR catalyst is controlled to provide an ammonia-to-NOmolar ratio (ANR) in the exhaust gas contacting the Fe-SCR catalyst of from greater than 2 to 6.