高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (S1): 392.

• Chemistry in Surface Science • 上一篇    下一篇

Effects of Preparation Methods and Interaction between Support and Oxide for Oxidative Dehydrogenation of Ethane over NiO/ZrO2

CHEN Tong, GUO Feng-Yuan, JIN Ming-Gong, WAN Hui-Lin   

  1. State Key Laboratory for Physical Chemistry of the Solid Surfaces, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005
  • 出版日期:2000-12-31 发布日期:2000-12-31
  • 通讯作者: CHEN Tong E-mail:chentong@jingxian.xmu.edu.cn
  • 基金资助:

    Supported by the Ministry of Science and Technology of China (No. G1999022408).

Effects of Preparation Methods and Interaction between Support and Oxide for Oxidative Dehydrogenation of Ethane over NiO/ZrO2

CHEN Tong, GUO Feng-Yuan, JIN Ming-Gong, WAN Hui-Lin   

  1. State Key Laboratory for Physical Chemistry of the Solid Surfaces, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005
  • Online:2000-12-31 Published:2000-12-31
  • Contact: CHEN Tong E-mail:chentong@jingxian.xmu.edu.cn
  • Supported by:

    Supported by the Ministry of Science and Technology of China (No. G1999022408).

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摘要：

The previous studies indicated that the unsupported and alumina supported nickel oxide catalysts are the attractive candidates for the oxidative dehydrogenation of ethane (ODE) reaction at lower reaction temperature[1,2]. In the present study, NiO/ZrO2 catalysts were prepared by the impregnation, complex of ammonia and coprecipitation, respectively, using the conventional incipient wetness technique. Over all samples used in this study, no NiO crystal structure was detected by XRD measurements carried out in parallel with the present work, which indicated the nickel oxide was highly dispersed on the support The blank testing indicated that the support ZrO2 had very little activity below 600℃. Comparing with the unsupported nickel oxide, it was found that the activity of NiO/ZrO2 catalysts prepared by the methods mentioned above decreased slightly and the selectivity for ethylene improved. With the increasing temperature, the ethane conversion increased and the selectivity for ethylene decreased However, the cracking of the ethane occurred at ca.450℃ on all samples prepared by different methods. The optimum catalytic behavior could be obtained on 5wt%NiO/ZrO2 prepared by coprecipitation, with the ethane conversion of 26.2% and selectivity for ethylene of 51.8% at as low temperature as 350℃. The sample prepared by coprecipitation and calcined at 500℃ was calcined again at 600℃ for 5 h,the activity decreased obviously, which may be attributed to the existence of the interaction between nickel oxide and support taking into account for the high dispersion of NiO on ZiO2.

Abstract:

The previous studies indicated that the unsupported and alumina supported nickel oxide catalysts are the attractive candidates for the oxidative dehydrogenation of ethane (ODE) reaction at lower reaction temperature[1,2]. In the present study, NiO/ZrO2 catalysts were prepared by the impregnation, complex of ammonia and coprecipitation, respectively, using the conventional incipient wetness technique. Over all samples used in this study, no NiO crystal structure was detected by XRD measurements carried out in parallel with the present work, which indicated the nickel oxide was highly dispersed on the support The blank testing indicated that the support ZrO2 had very little activity below 600℃. Comparing with the unsupported nickel oxide, it was found that the activity of NiO/ZrO2 catalysts prepared by the methods mentioned above decreased slightly and the selectivity for ethylene improved. With the increasing temperature, the ethane conversion increased and the selectivity for ethylene decreased However, the cracking of the ethane occurred at ca.450℃ on all samples prepared by different methods. The optimum catalytic behavior could be obtained on 5wt%NiO/ZrO2 prepared by coprecipitation, with the ethane conversion of 26.2% and selectivity for ethylene of 51.8% at as low temperature as 350℃. The sample prepared by coprecipitation and calcined at 500℃ was calcined again at 600℃ for 5 h,the activity decreased obviously, which may be attributed to the existence of the interaction between nickel oxide and support taking into account for the high dispersion of NiO on ZiO2.

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