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Highly Dispersed Pd Species Active in the Suzuki–Miyaura Reaction
Author(s) -
Okumura Kazu,
Matsui Hirosuke,
Tomiyama Takuya,
Sanada Takashi,
Honma Tetsuo,
Hirayama Sayaka,
Niwa Miki
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900711
Subject(s) - chemistry , x ray absorption fine structure , monomer , catalysis , palladium , amine gas treating , zeolite , solvent , absorption (acoustics) , photochemistry , inorganic chemistry , organic chemistry , materials science , polymer , composite material , quantum mechanics , spectroscopy , physics
Structures of Pd/zeolites immersed in solvents were measured by in situ X‐ray absorption fine structure (XAFS). Systematic studies revealed that the selection of an appropriate support (USY‐zeolite), thermal treatment temperature of USY, solvent ( o ‐xylene), H 2 partial pressure (6 %), and the use of a Pd amine complex affect the structure of Pd. As a result, we found that monomeric Pd can be obtained in the USY support with H 2 bubbling in o ‐xylene. The structural properties of Pd correlate well with its catalytic performance in the Suzuki–Miyaura coupling reactions; a very high TON of up to 11 000 000 was obtained over the monomeric Pd.