物理化学学报 >> 1994, Vol. 10 >> Issue (04): 324-329.doi: 10.3866/PKU.WHXB19940408

研究论文 上一篇    下一篇

甲烷氧化偶联Ti-La-Li系混合氧化物催化剂

赵震, 远松月, 于作龙   

  1. 中国科学院长春应用化学研究所,长春 130022
  • 收稿日期:1992-09-21 修回日期:1993-01-26 发布日期:1994-04-15
  • 通讯作者: 远松月

Study of Methane Oxidative Coupling over Ti-La-Li Mixed Oxides

Zhao Zhen, Yuan Song-Yue, Yu Zuo-Long   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1992-09-21 Revised:1993-01-26 Published:1994-04-15
  • Contact: Yuan Song-Yue

摘要:

研究了Ti-La-Li三元氧化物的组成、结构及其对甲烷氧化偶联反应的催化性能;用XRD、IR、XPS和SEM等方法对催化剂进行表征,结果表明:在LiTi_xLa_(1-x)O_2系列催化剂中,随x值的不同,可生成LaTi_(1-y)Li_yO_(3-λ)、Li_2TiO_3、La_(0.66)TiO_(2.993)、La_2O_3和Li_(1.33)Ti_(1.66)O_4几种物相,其中,钙钛矿到三元复合氧化物LaTi_(1-y)Li_yO_(3-λ)是甲烷氧化偶联反应的主要活性相,活性位Li~+-O~--Ti~(3+)的形成是活性提高的主要原因.Li_2TiO_3和La_(0.66)TiO_(2.993)是深度氧化活性相,而Li_(1.33)Ti_(1.66)O_4既无偶联活性,也无深度氧化活性.

关键词: 甲烷, 氧化偶联, 催化剂, 锂钛镧氧化物

Abstract:

The composition and structures of Li-Ti-La minxed oxides as well as their catalytic activity for methane oxidative coupling have been studied by means of XRD 、XPS、IR、SEM、 and so on. The results indicate that by changing x value in Li La_(1-x)Ti_xO_2 oxides phases of La_2O_3、 La-Ti_(1-y)Li_yO_(3-λ)、 Li_2TiO_3 and La_(0.66)TiO_(2.993) are formd. Among them the complex oalde LaTi1-y LiyO3-λ is the active phase for methane oxidative coupling due to the formation of active site Li~+-O~--Ti~(3+), while Li_(1.33)Ti_(1.66)O_4 is not active for both methane oxidative coupling and deep oxidation.

Key words: Methane, Oxidative coupling, Catalyst, Titanium-lanthanum-lithium