In situ FTIR study of low-pressure hydroformylation of 1-hexene catalyzed by ultrafine cobalt nanoparticles

doi:10.1016/S1872-2067(11)60504-4

Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (4): 781-788.DOI: 10.1016/S1872-2067(11)60504-4

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In situ FTIR study of low-pressure hydroformylation of 1-hexene catalyzed by ultrafine cobalt nanoparticles

WANG Hang, CAI Zhipeng, ZHONG Mengqi, YAO Siyu, KOU Yuan

PKU Green Chemistry Center, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2012-11-12 Revised:2012-12-17 Online:2013-04-23 Published:2013-04-24
Supported by:
This work was supported by the National Natural Science Foundation of China (21176221) and the National Basic Research Program of China (973 Program, 2011CB201402).

Abstract

Abstract:

The hydroformylation of 1-hexene in syngas (CO:H₂ = 1) under 2-3 MPa at 100℃ was catalyzed using 2.8 nm ultrafine cobalt nanoparticles and investigated by in situ Fourier transform infrared spectroscopy (FTIR). A group of bands observed in the in situ FTIR spectra at 2071, 2041, and 2022 cm^-1 are assigned to terminal CO adsorptions distributed over different Co sites. A band at 2054 cm^-1 is attributed to the intermediate, RCH₂CH₂COCo, which has been observed for the first time. Through this intermediate, the catalytic reaction proceeds via the elimination of RCH₂CH₂COCo to leave a single H atom on the surface of each 2.8-nm Co nanoparticle.

Key words: Cobalt nanoparticles, Hydroformylation, In-situ infrared spectroscopy, Mercury poisoning test, 1-Hexene

WANG Hang, CAI Zhipeng, ZHONG Mengqi, YAO Siyu, KOU Yuan. In situ FTIR study of low-pressure hydroformylation of 1-hexene catalyzed by ultrafine cobalt nanoparticles[J]. Chinese Journal of Catalysis, 2013, 34(4): 781-788.

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In situ FTIR study of low-pressure hydroformylation of 1-hexene catalyzed by ultrafine cobalt nanoparticles

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