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Suzuki–Miyaura reactions were performed over Pd loaded on (ultra-stable Y) USY zeolites prepared by steam treatment of NH 4 –Y. We found that the catalytic activity of Pd increased significantly with steam treatment of NH 4 –Y when 6% H 2 was applied before and during the reactions. For instance, a TON of 13,000,000 was obtained in the reaction between bromobenzene and phenylboronic...
Formation processes of the Pd clusters supported on USY were analyzed by means of time-resolved Quick XAFS. We found that the kind of precursors had profound effect on the formation of Pd 0 clusters. That is to say, Pd clusters with ca. 13 atoms were obtained through the addition of H 2 to Pd(NH 3 ) 4 Cl 2 /USY at room temperature, where the partial pressure...
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