title: Fully Copper-Exchanged High-Silica LTA Zeolites as Unrivaled Hydrothermally Stable NH3-SCR Catalysts.
abstract: Diesel engine technology is still the most effective solution to meet tighter CO2regulations 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 NOxreduction with NH3under 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.
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Taekyung
authors.initials: T
authors.lastname: Ryu
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Nak Ho
authors.initials: NH
authors.lastname: Ahn
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Seungwan
authors.initials: S
authors.lastname: Seo
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Jung
authors.initials: J
authors.lastname: Cho
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Hyojun
authors.initials: H
authors.lastname: Kim
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Donghui
authors.initials: D
authors.lastname: Jo
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Gi Tae
authors.initials: GT
authors.lastname: Park
authors.affiliation: Advanced Catalysts and Emission-Control Research Lab, Research & Development Division, Hyundai Motor Group, Hwaseong, Gyeonggi, 18280, Korea.
authors.forename: Pyung Soon
authors.initials: PS
authors.lastname: Kim
authors.affiliation: Advanced Catalysts and Emission-Control Research Lab, Research & Development Division, Hyundai Motor Group, Hwaseong, Gyeonggi, 18280, Korea.
authors.forename: Chang Hwan
authors.initials: CH
authors.lastname: Kim
authors.affiliation: EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, UK.
authors.forename: Elliott L
authors.initials: EL
authors.lastname: Bruce
authors.affiliation: EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, UK.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Wright
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: In-Sik
authors.initials: IS
authors.lastname: Nam
authors.affiliation: Center for Ordered Nanoporous Materials Synthesis, Division of Environmental Science and Engineering, POSTECH, Pohang, 37673, Korea.
authors.forename: Suk Bong
authors.initials: SB
authors.lastname: Hong
keywords: Cu-LTA; heterogeneous catalysis; hydrothermal stability; selective catalytic reduction; zeolites