Hydrogenolysis of Glycerol to 1,2-Propanediol on Boron Modified Cu/Al<sub>2</sub>O<sub>3</sub> Catalysts

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Abstract

Boron modified Cu/Al₂O₃ catalysts were prepared by the stepwise impregnation method. The catalyst property was characterized by XRD, FTIR, UV-Vis, N₂-sorption, H₂-TPR, NH₃-TPD and dissociative N₂O adsorption. The effects of the impregnation sequence and the boron content on the catalyst structure and performance were investigated. It was found that the addition of boron to Cu/Al₂O₃ can not only increase catalyst acidity but also enhance the Cu dispersion. It is obvious as the boron species was first introduced to the catalyst. Meanwhile, a strong interaction was formed between the boron and Cu species. However, the strong interaction reduced the number of the surface Cu atoms due to the coverage with the B species. This was more serious when the boron species was impregnated after Cu. In the hydrogenolysis of glycerol to 1,2-propanediol, the addition of boron before Cu more favored the performance of Cu/Al₂O₃. Under the condition of 220 ℃, 3.0 MPa, weight hourly space velocity of 2.0 h^-1, and the H₂/glycerol ratio of 20, with increasing the boron mass content from 0 to 2%, the glycerol conversion and the selectivity to 1,2-PDO increased from 17.1% to 99.9% and from 83.7% to 96.2%, respectively. The promotion effect of boron was found to correlate with the increased acidity and the interaction between Cu and B species.

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	Articles by authors
	Shi Heng
	Zhao Lanlan
	Chen Jixiang

Keywords： glycerol hydrogenolysis； copper catalyst； boron； 1,2-propanediol； acidity； dispersion

Received 2013-05-02;

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Shi Heng, Zhao Lanlan, Chen Jixiang.Hydrogenolysis of Glycerol to 1,2-Propanediol on Boron Modified Cu/Al₂O₃ Catalysts[J] Chemcial Industry and Engineering, 2015,V32(6): 13-17

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