应用化学 ›› 1998, Vol. 0 ›› Issue (4): 80-82.

• 研究论文 • 上一篇    下一篇

焙烧温度对La2O3-NiO体系结构和导电性及某些催化性能的影响

胡瑞生, 沈岳年, 孔繁清   

  1. 内蒙古大学化学系 呼和浩特 010021
  • 收稿日期:1997-10-15 修回日期:1998-04-22 出版日期:1998-08-10 发布日期:1998-08-10
  • 基金资助:
    内蒙古自然科学基金

The Effects of Calcination Temperature on the Structure, Conductivity and Catalytic Activities of La2O3-NiO System

Hu Ruisheng, Shen Yuenian, Kong Fanqing   

  1. Department of Chemistry, Inner Mogolia University, Hohhot 010021
  • Received:1997-10-15 Revised:1998-04-22 Published:1998-08-10 Online:1998-08-10

摘要: 稀土氧化物特别是La2O3作为助催化剂,对CO甲烷化反应有促进作用,已为人们所知[1].研究焙烧温度对La2O3-NiO催化剂结构、导电性,特别是对其在不同类型反应中催化性能的影响,目前文献报道较少.本文通过多晶X射线衍射(XRD),差热一热重分析(DTA-TG),导电性测量,CO甲烷化及二甲苯完全氧化反应活性测定等手段,考察了所制备的La2O3-NiO催化剂经不同温度焙烧后,结构、热效应、导电性的变化,并研究了该体系催化剂在上述两种不同类型反应中的催化性能.

关键词: La2O3-NiO, 焙烧温度, 导电性, 催化性能

Abstract: The phase structure of La2O3-NiO system at various calcination temperatures havebeen studied by XRD and DTA-TG techniques.It is found that at 450~600℃ there aremixed phases of La2O3 and NiO and at 800~900℃ only a single phase of perovskite LaNiO3.The conductivity of the system increases with the increase in calcination temperature.Attemperature 600~800℃ a sudden change of the conductivity occurred in correspondencewith the phase transformation of the system.The catalytic activities of the system calcinatedat 600℃ and 800℃ also show a distinct "activity gap" for CO methanation and xylene combustion.

Key words: La2O3-NiO, calcination temperature, conductivity, catalytic activity