Cerium-modified manganese octahedral molecular sieves as catalysts for selective catalytic reduction

US10124325B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• John Kilmartin · Providence, US
• Janet Mary Fisher · Calcot, GB
• Jillian Elaine Collier · Reading, GB
• David Thompsett · Reading, GB
• Raj Rao Rajaram · Slough, GB

Key dates

• Filing date: Mar 14, 2014
• Grant date: Nov 13, 2018
• Expiry date: Mar 14, 2034

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J35/615
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Catalysts and articles useful for selective catalytic reduction (SCR) are disclosed. The catalyst comprises a cerium oxide and an octahedral molecular sieve (OMS) comprising manganese oxide. The catalysts, which comprise 0.1 to 50 wt. % of cerium, can be made by doping, ion-exchange, deposition, or other techniques. Also disclosed is an SCR process in which a gaseous mixture comprising nitrogen oxides is selectively reduced in the presence of a reductant and the cerium-modified OMS catalyst. The cerium-modified manganese oxide OMS catalysts offer unexpected advantages for selective catalytic reduction, especially NH3-SCR, including improved thermal stability and improved activity for NOx conversion, especially at relatively low temperatures (100° C. to 250° C.).