Abstract
Pt nanoparticles supported on three-dimensionally ordered macroporous carbon (Pt/3DC) were prepared and applied as catalyst after chirally modified with cinchonidine for the enantioselective hydrogenation of ethyl pyruvate. The catalyst was characterized by SEM, TEM, powder XRD, N2 sorption, and CO chemisorption, which confirmed the well-defined periodic macroporous structure of Pt/3DC and the high dispersion of Pt nanoparticles on the support. High catalytic performance was achieved over chirally modified Pt/3DC catalyst in the asymmetric hydrogenation of ethyl pyruvate. A high turnover frequency of 11,800h−1 with an enantiomeric excess of 79.5% was acquired in acetic acid. In particular, this catalyst exhibited high durability in the asymmetric hydrogenation system and could be easily reused at least 13 times with well-maintained catalytic activity and slightly decreased enantioselectivity. Moreover, the comparison of catalytic performance between Pt/3DC and commercial Pt/C as well as Pt/Al2O3 was carried out.
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