Download PDF
Synfacts 2011(8): 0913-0913  
DOI: 10.1055/s-0030-1260706
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart ˙ New York

A Platinum Nanocatalyst Confined within Carbon Nanotubes

Contributor(s): Yasuhiro Uozumi, Yoichi M. A. Yamada, Maki Minakawa
Z. Chen, Z. Guan, M. Li, Q. Yang, C. Li*
Dalian Institute of Chemical Physics, P. R. of China
Further Information

Publication History

Publication Date:
20 July 2011 (online)

   Permissions and Reprints

Significance

A Pt nanocatalyst confined within nanochannels of carbon nanotubes (CNTs) was described. Treatment of multi-wall CNTs with 68 wt% HNO3 (140 ˚C, 14 h) gave the CNTs with open ends. After ultrasonication of the CNTs and H2PtCl6 in H2O for 3 h, the mixture was stirred at r.t. for 48 h, and then heated to 110 ˚C with a heat range of 1 ˚C/min and held at 110 ˚C for 24 h. ­Reduction of the catalyst precursor with sodium formate led to Pt nanoparticles within the channel of CNTs, which were modified with cinchonidine in AcOH. Asymmetric hydrogenation of α-keto esters was performed under H2 using the chirally modified catalyst affording the corresponding α-hydroxy esters with 86-96% ee.