物理化学学报 >> 2000, Vol. 16 >> Issue (04): 331-337.doi: 10.3866/PKU.WHXB20000408

研究论文 上一篇    下一篇

载Ni双功能碱性沸石催化剂的研究

姜慧君, 杨春, 孟中岳   

  1. 南京师范大学化学系,南京 210097
  • 收稿日期:1999-08-09 修回日期:1999-11-02 发布日期:2000-04-15
  • 通讯作者: 杨春

Study on Ni-supported Bifunctional Basic Zeolite Catalyst

Jiang Hui-Jun, Yang Chun, Meng Zhong-Yue   

  1. Department of Chemistry,Nanjing Normal University,Nanjing 210097
  • Received:1999-08-09 Revised:1999-11-02 Published:2000-04-15
  • Contact: Yang Chun

摘要:

采用分步浸渍法制备了负载Ni和KOH的NaX沸石催化剂 ,用XRD、TPR、CO2 TPD和XPS等手段对样品的结构、表面碱性、金属组分的可还原性、表面Ni物种的形态等进行了表征 ,对金属组分和碱性组分间的相互作用进行了研究 ,并揭示了这种作用的本质. 同时结合丙酮一步法合成甲基异丁基酮的反应 ,探讨了反应性与样品碱性、金属性的关系 ,阐明了该反应中双功能催化剂上金属组分与碱性组分必须匹配合宜的原因.

关键词: NaX沸石, Ni, KOH, 碱性, 可还原性, 相互作用

Abstract:

Ni-K/NaX catalysts were prepared by impregnating NaX with KOH and Ni(NO3)2 solution. The reducibility and the state of Ni species and the basicity of the samples were characterized by XRD、TPR、CO2-TPD and XPS techniques. It is shown that there is an interaction between metallic species and NaX, as well as KOH, which results in the easy reduction of Ni2+and the decrease in basicity of the sample. In the reaction of condensation of acetone to methyl isobutyl ketone(MIBK), the reason why a suitable balance between basicity and metallicity of catalysts is necessary for selective MIBK production has been revealed.

Key words: NaX zoelites, Ni, KOH, Basicity, Reducibility, Interaction