催化学报 ›› 2007, Vol. 28 ›› Issue (3): 193-195.

• 研究快讯 • 上一篇    下一篇

载体对Ni基催化剂催化甲烷三重整反应性能的影响

姜洪涛1,2,李会泉1,张懿1   

  1. 1 中国科学院过程工程研究所, 北京 100080; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-03-25 出版日期:2007-03-25 发布日期:2007-03-25

Effect of Supports on Catalytic Performance of Ni-Based Catalysts for Tri-reforming of Methane

JIANG Hongtao1,2, LI Huiquan1*, ZHANG Yi1   

  1. 1 Institute of Process Engineering, The Chinese Academy of Sciences, Beijing 100080, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-03-25 Online:2007-03-25 Published:2007-03-25

摘要: 制备了Ni/TiO2, Ni/Mg0.5Ti0.5Ox和Ni/MgO三种催化剂并考察了它们对甲烷三重整反应的催化性能. 结果表明,将Ti引入NiO-MgO体系中可以阻止固溶体的形成,而又不改变Ni的分散度. Ni/TiO2与Ni/MgO的活性随反应时间的延长而降低; Ni/Mg0.5Ti0.5Ox的催化稳定性最好,这与其氧化-还原性以及金属与载体间适度的相互作用有关.

关键词: 镍, 氧化镁, 二氧化钛, 复合氧化物, 甲烷, 三重整

Abstract: MgO, TiO2, and Mg0.5Ti0.5Ox composite oxides were prepared by the sol-gel technique. Ni was supported on these oxides by the wet impregnation method. No peak of free NiO was observed in all X-ray diffraction patterns of the catalysts. The addition of Ti to the NiO-MgO system prevents the formation of solid solution but does not decrease the dispersion of Ni particles. The catalytic performance of the catalysts for tri-reforming of methane was investigated in a fixed-bed flow reactor at 850 ℃ under 1.0 MPa with space velocity of 31 800 ml/(g·h) and feed composition of n(CH4)∶n(CO2)∶n(H2O)∶n(O2)=1∶0.48∶0.54∶0.1. The catalytic activity of Ni/TiO2 and Ni/MgO decreases during the reaction period. The Ni/Mg0.5Ti0.5Ox catalyst has a relatively high stability, which is mainly dependent on the moderate interaction between the metal and the support and the moderate ability to be reduced.

Key words: nickel, magnesia, titania, composite oxide, methane, tri-reforming