Fully Copper‐Exchanged High‐Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH3‐SCR Catalysts. (18th January 2017)

• Record Type: Journal Article
• Authors: Ryu, Taekyung; Ahn, Nak Ho; Seo, Seungwan; Cho, Jung; Kim, Hyojun; Jo, Donghui; Park, Gi Tae; Kim, Pyung Soon; Kim, Chang Hwan; Bruce, Elliott L.; Wright, Paul A.; Nam, In‐Sik; Hong, Suk Bong
• Is Part Of: Angewandte Chemie. Volume 129:Number 12(2017)
• Page Start: 3304
• Page End: 3308
• Publication Date: 2017-01-18
• Subjects: Cu-LTA -- Heterogene Katalyse -- Hydrothermalbedingungen -- Selektive katalytische Reduktion -- Zeolithe; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201610547
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Diesel engine technology is still the most effective solution to meet tighter CO2 regulations in the mobility and transport sector. In implementation of fuel‐efficient diesel engines, the poor thermal durability of lean nitrogen oxides (NO x ) aftertreatment systems remains as one major technical hurdle. Divalent copper ions when fully exchanged into high‐silica LTA zeolites are demonstrated to exhibit excellent activity maintenance for NO x reduction with NH3 under vehicle simulated conditions even after hydrothermal aging at 900 °C, a critical temperature that the current commercial Cu‐SSZ‐13 catalyst cannot overcome owing to thermal deactivation. Detailed structural characterizations confirm the presence of Cu 2+ ions only at the center of single 6‐rings that act not only as a catalytically active center, but also as a dealumination suppressor. The overall results render the copper‐exchanged LTA zeolite attractive as a viable substitute for Cu‐SSZ‐13.