Molecular sieve catalyst compositions, catalytic composites, systems, and methods

US10850265B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Xiaofan Yang · Knoxville, US
• John K. Hochmuth · Bound Brook, US
• Wen-Mei Xue
• Xiaoming Wang · Sunnyvale, US
• Matthew Tyler Caudle · Hillsborough Township, US
• Ahmad Moini · Princeton, US
• Dustin O. Hollobaugh · Ewing, US
• Qi Fu · Shanghai, CN
• Michael Breen · Erie, US

Key dates

• Filing date: Jun 17, 2015
• Grant date: Dec 1, 2020
• Expiry date: Jun 17, 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. In another aspect, described is a selective catalytic reduction composite comprising an SCR catalyst material and an ammonia storage material comprising a transition metal having an oxidation state of IV. The SCR catalyst material promotes the reaction of ammonia with nitrogen oxides to form nitrogen and H2O selectively over a temperature range of 150° C. to 600° C., and the SCR catalyst material is effective to store ammonia at temperatures of 400° C. and above. A method for selectively reducing nitrogen oxides, and a method for simultaneously selectively reducing nitrogen oxide and storing ammonia are also described. Additionally, an exhaust gas treatment system is also described.