Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 12, Pages 3256-3260Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201610547
Keywords
Cu-LTA; heterogeneous catalysis; hydrothermal stability; selective catalytic reduction; zeolites
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Funding
- National Creative Research Initiative Program through the National Research Foundation of Korea [2012R1A3A2048833]
- Hyundai Motor Group
- MSIP
- POSTECH
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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 (NOx) 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 NOx reduction with NH3 under vehicle simulated conditions even after hydrothermal aging at 900 degrees 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.
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