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- Title
Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH<sub>3</sub>-SCR Catalysts.
- 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
- 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 Cu2+ 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.
- Subjects
COPPER; ZEOLITES; SILICATE minerals; CATALYTIC activity; HYDROTHERMAL synthesis
- Publication
Angewandte Chemie, 2017, Vol 129, Issue 12, p3304
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201610547