Coated articles having high kNOx/kSOx ratios for selective catalytic reduction

US10618000B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• Paul Joseph Andersen · Audubon, US
• Maria Brandmair · Unterschleißheim, DE
• Silvia Alcove CLAVE · Reading, GB
• Rodney Foo · Nivelles, BE
• Bruce GOMERSALL · Reading, GB
• Michael Nash · Cary, US
• Alison Mary Wagland · Felton, GB

Key dates

• Filing date: Sep 1, 2017
• Grant date: Apr 14, 2020
• Expiry date: Sep 1, 2037

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/41
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Articles comprising a catalyst film comprising VOx, MoO3 or WO3, and TiO2 deposited on a substrate are disclosed. The articles are useful for selective catalytic reduction (SCR) of NOx in exhaust gases. Methods for producing such articles deposit a catalyst film on the substrate to form a coated substrate, which is then calcined. When used in an SCR process, the coated articles have enhanced activity for NOx conversion, reduced activity for SOx conversion, or both. Light-weight, coated articles having high catalyst loads can be fabricated at the same or reduced dimensions when compared with laminated articles, and increased kNOx/kSOx ratios are available even from coated articles having relatively thin catalyst films. The articles should have particular value for power plant operations, where coal and high-sulfur fuels are commonly used and controlling sulfur trioxide generation is critical.