Three-way metal cluster catalysts confined in zeolites produced by pulsed laser ablation in liquid

• Published in: Applied physics. A, Materials science & processing Vol. 128; no. 11
• Main Authors: Takeda, Yoshihiro, Toyama, Namiki, Egashira, Kazuhiro
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2022; Springer Nature B.V
• Subjects: Ablation; Acetone; Applied physics; Carbon monoxide; Catalysts; Catalytic activity; Characterization and Evaluation of Materials; Chemical synthesis; Condensed Matter Physics; Ion exchange; Laser ablation; Lasers; Machines; Manufacturing; Materials science; Metal clusters; Nanotechnology; Optical and Electronic Materials; Oxidation; Palladium; Physics; Physics and Astronomy; Processes; Pulsed lasers; Rhodium; Surfaces and Interfaces; Thermal stability; Thin Films; Zeolites; Three-way reaction; NO–CO reaction; Laser ablation in liquid; Three-way catalyst; Zeolite-confined clusters
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-06141-4

We synthesized three-way catalysts consisting of rhodium, platinum, or palladium clusters confined in zeolites produced by pulsed laser ablation (LA) in liquid acetone. A plate of the catalytic metals was irradiated with a pulsed laser in an acetone suspension of zeolite powder. The catalytic properties of the samples were evaluated for the three-way reaction, CO oxidation reaction, and NO–CO reaction. The zeolite-confined clusters generated by LA had higher thermal stability than those supported on α-Quartz (αQ) particles produced by LA. The cluster size matched those of the pores, resulting in a large contact area with the surface of the pores. Therefore, the metal clusters supported by zeolite were efficiently stabilized in the zeolite pores by a larger number of Rh–O–Si bonds than those supported on αQ particles produced by LA. Moreover, the zeolite-confined clusters generated by LA had higher catalytic activity than clusters on zeolite produced by traditional metal-ion exchange followed by reduction.