title: Suzuki Coupling Reactions Catalyzed by PdO Dispersed on Dealuminated Y Zeolite in Air under Ambient Conditions.
abstract: Suzuki coupling reactions are performed using PdO loaded on dealuminated Y (USY) zeolite. The reaction between bromobenzene and phenylboronic acid is complete in 15 min at room temperature in air, with a turnover number of 1300. The reaction can be repeated at least five times by using 1 wt % Pd. Inductively coupled plasma analysis does not reveal the dissolution of Pd from products, even if the reaction is repeated up to four times. Pd K-edge extended X-ray absorption fine structure analysis reveals the presence of molecular-like PdO and a mixture of Pd(0) -PdO before and after the reaction, respectively. This is probably because Pd stabilized by Al sites is present at the II sites of the Y-type zeolite, as estimated using first-principles calculations. Conversely, Pd species change to PdO clusters after repeated reactions in air using the thermally treated sample.
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Kogakuin University, 2665-1 Nakano-machi, Hachioji City, Tokyo (Japan). okmr@cc.kogakuin.ac.jp.
authors.forename: Kazu
authors.initials: K
authors.lastname: Okumura
authors.affiliation: Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori City, Tottori (Japan).
authors.forename: Takumi
authors.initials: T
authors.lastname: Mushiake
authors.affiliation: Department of Applied Mathematics and Physics, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori City, Tottori (Japan).
authors.forename: Yu
authors.initials: Y
authors.lastname: Matsui
authors.affiliation: Department of Applied Mathematics and Physics, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori City, Tottori (Japan).
authors.forename: Akira
authors.initials: A
authors.lastname: Ishii
mesh_terms: D000388:Air; D000535:Aluminum / Q000737:chemistry*; D002384:Catalysis; D010165:Palladium / Q000737:chemistry*; D013696:Temperature; D017641:Zeolites / Q000737:chemistry*
chemical_list: D017641:Zeolites; D010165:Palladium; C048320:palladium oxide; D000535:Aluminum
keywords: Suzuki coupling; X-ray absorption fine structure; first-principle calculations; palladium; zeolites