Effect of NaOH concentration on performance of Ru-Zn catalyst for selective hydrogenation of benzene to cyclohexene

doi:10.11949/j.issn.0438-1157.20151370

Abstract

Abstract:

Ru-Zn catalysts were prepared by the co-precipitation method, and the effect of the different NaOH concentration as precipitant and reduction medium on the performance of Ru-Zn catalyst for selective hydrogenation of benzene to cyclohexene was investigated. The catalysts were characterized by X-ray diffraction (XRD), N₂ physisorption (BET), X-ray fluorescene (XRF) and transmission electron micrograph (TEM). It was found that the concentration of NaOH could modify the Zn contents, particle size and pore diameter, and then affect the performance of Ru-Zn catalysts. The Ru-Zn catalyst prepared with the NaOH concentration of 15% gave a high cyclohexene yield of 61.5%. Moreover, this catalyst exhibited the excellent reusability.

Key words: benzene, hydrogenation, ruthenium, catalyst, precipitant, reduction medium

摘要：

用共沉淀法制备了纳米Ru-Zn催化剂,考察了不同浓度NaOH同时作沉淀剂和还原介质对苯选择加氢制环己烯Ru-Zn催化剂性能的影响,并用X射线衍射(XRD)、N₂物理吸附(BET)、X射线荧光光谱(XRF)和透射电镜(TEM)手段等对催化剂进行了表征。结果表明,NaOH浓度可以调变Ru-Zn催化剂的Zn含量、粒径和孔径,进而影响Ru-Zn催化剂的苯选择加氢制环己烯性能。NaOH含量为15%时制备的Ru-Zn催化剂在优化的反应条件下获得了61.5%的环己烯收率,而且该催化剂具有良好的重复使用性能。

关键词: 苯, 加氢, 钌, 催化剂, 沉淀剂, 还原介质

CLC Number:

X511

SUN Haijie, CHEN Xiuli, HUANG Zhenxu, LIU Zhongyi, LIU Shouchang. Effect of NaOH concentration on performance of Ru-Zn catalyst for selective hydrogenation of benzene to cyclohexene[J]. CIESC Journal, 2016, 67(4): 1324-1332.

孙海杰, 陈秀丽, 黄振旭, 刘仲毅, 刘寿长. NaOH浓度对苯选择加氢制环己烯Ru-Zn催化剂性能的影响[J]. 化工学报, 2016, 67(4): 1324-1332.

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