Isomorphously substituted catalyst

US9889437B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Xiaofan Yang · Knoxville, US
• John K. Hochmuth · Bound Brook, US

Key dates

• Filing date: Apr 15, 2015
• Grant date: Feb 13, 2018
• Expiry date: Apr 15, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2235/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Described is a selective catalytic reduction catalyst comprising a zeolitic framework material of silicon and aluminum atoms, wherein a fraction of the silicon atoms are isomorphously substituted with a tetravalent metal. The catalyst can include a promoter metal such that the catalyst effectively promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H2O selectively over a temperature range of 150 to 650° C. A method for selectively reducing nitrogen oxides and an exhaust gas treatment system are also described.