Effect of Y2O3-Doped ZrO2 on the Catalytic Performance of Ru-La-B/ZrO2 for Selective Hydrogenation of Benzene to Cyclohexene

doi:10.3724/SP.J.1095.2014.40022

Chinese Journal of Applied Chemistry

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Effect of Y₂O₃-Doped ZrO₂ on the Catalytic Performance of Ru-La-B/ZrO₂ for Selective Hydrogenation of Benzene to Cyclohexene

SUN Haijie^1,2, CHEN Lingxia², LI Shuaihui¹, ZHANG Yuanxin¹, LIU Shouchang¹, LIU Zhongyi^1*, REN Baozeng³

(1.College of Chemistry and Molecular Engnineering,Zhengzhou University,Zhengzhou 450001,China;
2.Institute of Environmental and Catalytic Engineering,Department of Chemistry,
Zhengzhou Normal University,Zhengzhou 450044,China;
3.School of Chemical Engineering and Energy,Zhengzhou University,Zhengzhou 450001,China)

Received:2014-01-20 Revised:2014-03-29 Published:2014-10-09 Online:2014-10-09

Abstract

Abstract: The nano-scale pure ZrO2 and the Y2O3-doped ZrO2(ZrO2-Y) were prepared by the hydrothermal synthesis method, and investigated as supports of Ru-La-B/ZrO2 catalysts. It was confirmed that both of them have similar crystallite size, texture property and particle size distribution. ZrO2 only has a monoclinic phase. ZrO2-Y not only has a monoclinic phase, but also some of the tetragonal phase. Y2O3 doping can affect the composition and the phase structure of ZrO2. The Y2O3 doping can cover some of the active sites which are unsuitable for the formation of cyclohexene. Thus the activity of the catalyst supported on ZrO2-Y is lower than that of catalyst supported on ZrO2, and the selectivity to cyclohexene of the former is higher than that of the latter at low benzene conversion. The Ru-La-B catalysts supported on ZrO2-Y has a poorer hydrophilicity than that supported on ZrO2 due to the lower content of the surface hydroxyl groups on the tetragonal phase of ZrO2-Y. It is difficult for cyclohexne to be desorbed from the surface of the catalyst with ZrO2-Y as supports. Thus the selectivity to cyclohexene of the catalyst supported on ZrO2-Y is lower than that supported on ZrO2 when the benzene conversion exceeds 52.0%. A cyclohexene yield of 52.1% is achieved on the Ru-La-B catalysts supported on ZrO2 at 20 min, however, only 45.2% is obtained on that supported on ZrO2-Y. Therefore, the nano-scale monoclinic ZrO2 is more suitable support of the catalyst for the selective hydrogenation of benzene to cyclohexene.

Key words: benzene, selective hydrogenation, cyclohexene,ZrO2, Y2O3 doping

CLC Number:

O643

SUN Haijie1,2, CHEN Lingxia2, LI Shuaihui1, ZHANG Yuanxin1, LIU Shouchang1, LIU Zhongyi1*, REN Baozeng3. Effect of Y₂O₃-Doped ZrO₂ on the Catalytic Performance of Ru-La-B/ZrO₂ for Selective Hydrogenation of Benzene to Cyclohexene[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40022.

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Effect of Y₂O₃-Doped ZrO₂ on the Catalytic Performance of Ru-La-B/ZrO₂ for Selective Hydrogenation of Benzene to Cyclohexene

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