Palladium/Beta zeolite passive NOx adsorbers (PNA): Clarification of PNA chemistry and the effects of CO and zeolite crystallite size on PNA performance. - Khivantsev, Konstantin; Jaegers, Nicholas R.; Kovarik, Libor; Prodinger, Sebastian; Derewinski, Miroslaw A.; Wang, Yong; Gao, Feng; Szanyi, János (Applied Catalysis A: General, 2019)