Reduction of Co<sub>3</sub>O<sub>4</sub> by Hydrogen to Prepare Nano-Cobalt and the Study of Hydrogenation of Ethyl Lactate

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Abstract

Nano-cobalt materials play an important role in the hydrogenation of ethyl lactate to 1,2-PDO. Herein, Co₃O₄ nanomaterials with different morphologies were synthesized, which were further reduced under hydrogen atmosphere to form nano-cobalt. The TEM results indicated that nano-cobalt materials obtained from Co₃O₄ at a low temperature kept original morphologies. The TPR results showed that the Co₃O₄ nanoparticles reduced at a low temperature were easier to generate metal cobalt than Co₃O₄ nanorods. Hence, cobalt nanoparticles gave an excellent conversion for the hydrogenation of ethyl lactate while cobalt nanorods had no activity. Furthermore, the effect of reduction temperature of Co₃O₄ on the nano-cobalt crystal structures was investigated. XRD and TEM results showed that the hcp phase can be produced at a lower temperature. With increasing the reduction temperature, the transformation from hcp phase to fcc phase would take place. The effect of cobalt nanoparticles reduced at different temperature on the performance of hydrogenation of ethyl lactate was studied. Experiments proved that the cobalt nanoparticles had a positive effect on the hydrogenation performance till the reduction temperature increased to 300℃ with a 71% conversion of ethyl lactate. However, when the reduction temperature increased continually, the conversion of ethyl lactate decreased. It indicated that the hcp phase was beneficial to the hydrogenation of ethyl lactate while the fcc phase hampered the hydrogenation of ethyl lactate. In addition, aggregation may also lower the catalytic activity above 300℃.

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	Articles by authors
	Zhang Xiaopeng
	Han Jinyu
	Wang Hua
	Liu Xiao
	Zhao Jiankang

Keywords： ethyl lactate； hydrogenation； cobalt nanoparticles； reduction temperature； crystal structures

Received 2016-04-01;

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Cite this article:

Zhang Xiaopeng, Han Jinyu, Wang Hua, Liu Xiao, Zhao Jiankang.Reduction of Co₃O₄ by Hydrogen to Prepare Nano-Cobalt and the Study of Hydrogenation of Ethyl Lactate[J] Chemcial Industry and Engineering, 2018,V35(1): 8-14

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