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Citation: Zaihong Guan, Shengmei Lu, Can Li. Highly oxidized Pt species stabilized inside carbon nanotubes for asymmetric hydrogenation[J]. Chinese Journal of Catalysis, ;2015, 36(9): 1535-1542. doi: 10.1016/S1872-2067(15)60831-2 shu

Highly oxidized Pt species stabilized inside carbon nanotubes for asymmetric hydrogenation

1.
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

Corresponding author: Can Li,
Received Date: 20 January 2015
Available Online: 3 March 2015
Fund Project: 国家自然科学基金(20921092, 21227801). (20921092, 21227801)

The chemical state and its influence on Pt species in or outside of the channels of CNTs and the effect on the asymmetric hydrogenation of α-ketoester were investigated. XPS analysis showed that 13% Pt species in a highly oxidized state (Pt⁴⁺) were stabilized inside the channels in the presence of Na⁺. There were more highly oxidized Pt species inside the CNTs than outside. The highly oxidized Pt species promoted the interaction between the nanoparticle and chiral modifier, which is crucial for high enantioselectivity. Hydrogen temperature programmed desorption showed that Pt nanoparticles confined in the channels can better activate hydrogen, which contributed to their high activity even at low hydrogen pressure.
- Carbon nanotube,
- α-Ketoester,
- Asymmetric hydrogenation,
- Platinum nanoparticle,
- Oxidized state
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