ACS Catalysis p. 666 - 670 (2016)
Update date:2022-08-17
Topics:
Mitsudome, Takato
Urayama, Teppei
Yamazaki, Kenji
Maehara, Yosuke
Yamasaki, Jun
Gohara, Kazutoshi
Maeno, Zen
Mizugaki, Tomoo
Jitsukawa, Koichiro
Kaneda, Kiyotomi
We designed core-Pd/shell-Ag nanocomposite catalyst (Pd@Ag) for highly selective semihydrogenation of alkynes. The construction of the core-shell nanocomposite enables a significant improvement in the low activity of Ag NPs for the selective semihydrogenation of alkynes because hydrogen is supplied from the core-Pd NPs to the shell-Ag NPs in a synergistic manner. Simultaneously, coating the core-Pd NPs with shell-Ag NPs results in efficient suppression of overhydrogenation of alkenes by the Pd NPs. This complementary action of core-Pd and shell-Ag provides high chemoselectivity toward a wide range of alkenes with high Z-selectivity under mild reaction conditions (room temperature and 1 atm H2). Moreover, Pd@Ag can be easily separated from the reaction mixture and is reusable without loss of catalytic activity or selectivity.
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