Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (5): 710-716.

Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts

Haijie Sun^b, Yajie Pan^a, Shuaihui Li^a, Yuanxin Zhang^a, Yingying Dong^a, Shouchang Liu^a, Zhongyi Liu^a

a. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China;
b. Institute of Environmental and Catalytic Engineering, Department of Chemistry, Zhengzhou Normal University, Zhengzhou 450044, Henan, China

收稿日期:2012-11-30 修回日期:2013-01-14 出版日期:2013-09-20 发布日期:2013-09-30
通讯作者: Zhongyi Liu
基金资助:
This work was supported by the National Nature Science Foundation of China (21273205), the Innovation Found for Technology Based Firms of China (10C26214104505), the Chinese Post-doctorate Science Fund 51th batch of surface subsidizes (2012M511125) and the Scientific Research Foundation of Graduate School of Zhengzhou University.

Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts

Haijie Sun^b, Yajie Pan^a, Shuaihui Li^a, Yuanxin Zhang^a, Yingying Dong^a, Shouchang Liu^a, Zhongyi Liu^a

a. College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China;
b. Institute of Environmental and Catalytic Engineering, Department of Chemistry, Zhengzhou Normal University, Zhengzhou 450044, Henan, China

Received:2012-11-30 Revised:2013-01-14 Online:2013-09-20 Published:2013-09-30
Supported by:
This work was supported by the National Nature Science Foundation of China (21273205), the Innovation Found for Technology Based Firms of China (10C26214104505), the Chinese Post-doctorate Science Fund 51th batch of surface subsidizes (2012M511125) and the Scientific Research Foundation of Graduate School of Zhengzhou University.

摘要/Abstract

摘要： Ru-Ce catalysts were prepared by a co-precipitation method. The effects of Ce precursors with different valences and Ce contents on the catalytic performance of Ru-Ce catalysts were investigated in the presence of ZnSO₄. The Ce species in the catalysts prepared with different valences of the Ce precursors all exist as CeO₂ on the Ru surface. The promoter CeO₂ alone could not improve the selectivity to cyclohexene of Ru catalysts. However, almost all the CeO₂ in the catalysts could react with the reaction modifier ZnSO₄ to form (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃ salt. The amount of the chemisorbed salt increased with the CeO₂ loading, resulting in the decrease of the activity and the increase of the selectivity to cyclohexene of Ru catalyst. The Ru-Ce catalyst with the optimum Ce/Ru molar ratio of 0.19 gave a maximum cyclohexene yield of 57.4%. Moreover, this catalyst had good stability and excellent reusability.

关键词: benzene, selective hydrogenation, cyclohexene, ruthenium, cerium

Abstract: Ru-Ce catalysts were prepared by a co-precipitation method. The effects of Ce precursors with different valences and Ce contents on the catalytic performance of Ru-Ce catalysts were investigated in the presence of ZnSO₄. The Ce species in the catalysts prepared with different valences of the Ce precursors all exist as CeO₂ on the Ru surface. The promoter CeO₂ alone could not improve the selectivity to cyclohexene of Ru catalysts. However, almost all the CeO₂ in the catalysts could react with the reaction modifier ZnSO₄ to form (Zn(OH)₂)₃(ZnSO₄)(H₂O)₃ salt. The amount of the chemisorbed salt increased with the CeO₂ loading, resulting in the decrease of the activity and the increase of the selectivity to cyclohexene of Ru catalyst. The Ru-Ce catalyst with the optimum Ce/Ru molar ratio of 0.19 gave a maximum cyclohexene yield of 57.4%. Moreover, this catalyst had good stability and excellent reusability.

Key words: benzene, selective hydrogenation, cyclohexene, ruthenium, cerium

Haijie Sun, Yajie Pan, Shuaihui Li, Yuanxin Zhang, Yingying Dong, Shouchang Liu, Zhongyi Liu. Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts[J]. 能源化学(英文), 2013, 22(5): 710-716.

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Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts

Selective hydrogenation of benzene to cyclohexene over Ce-promoted Ru catalysts

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