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Achieving Atomic Dispersion of Highly Loaded Transition Metals in Small‐Pore Zeolite SSZ‐13: High‐Capacity and High‐Efficiency Low‐Temperature CO and Passive NO x Adsorbers
Author(s) -
Khivantsev Konstantin,
Jaegers Nicholas R.,
Kovarik Libor,
Hanson Jonathan C.,
Tao Franklin Feng,
Tang Yu,
Zhang Xiaoyan,
Koleva Iskra Z.,
Aleksandrov Hristiyan A.,
Vayssilov Georgi N.,
Wang Yong,
Gao Feng,
Szanyi János
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201809343
Subject(s) - chabazite , nox , zeolite , palladium , transition metal , catalysis , chemical engineering , dispersion (optics) , materials science , chemistry , inorganic chemistry , organic chemistry , combustion , physics , optics , engineering
The majority of harmful atmospheric CO and NO x emissions are from vehicle exhausts. Although there has been success addressing NO x emissions at temperatures above 250 °C with selective catalytic reduction technology, emissions during vehicle cold start (when the temperature is below 150 °C), are a major challenge. Herein, we show we can completely eliminate both CO and NO x emissions simultaneously under realistic exhaust flow, using a highly loaded (2 wt %) atomically dispersed palladium in the extra‐framework positions of the small‐pore chabazite material as a CO and passive NO x adsorber. Until now, atomically dispersed highly loaded (>0.3 wt %) transition‐metal/SSZ‐13 materials have not been known. We devised a general, simple, and scalable route to prepare such materials for Pt II and Pd II . Through spectroscopy and materials testing we show that both CO and NO x can be simultaneously completely abated with 100 % efficiency by the formation of mixed carbonyl‐nitrosyl palladium complex in chabazite micropore.