高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (2): 275.

• 论文 • 上一篇    下一篇

在Ti系钙钛矿型混合氧化物催化剂上的甲烷氧化偶联──焙烧温度的影响

赵震1, 远松月1, 于作龙2   

  1. 1. 中国科学院长春应用化学研究所, 长春 130022;
    2. 中国科学院成都有机化学研究所, 成都
  • 收稿日期:1994-02-03 修回日期:1994-08-15 出版日期:1995-02-24 发布日期:1995-02-24
  • 通讯作者: 远松月
  • 作者简介:赵震,男,28岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Studies on the Perovskite-Type Mixed Catalysts of Titanium System for Oxidative Coupling of Methane─The Influence of Calcination Temperature

ZHAO Zhen1, YUAN Song-Yue1, YU Zuo-Long2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun, 130022;
    2. Chengdu Institute of Organic Chemistry, Academia Sinica, Chengdu
  • Received:1994-02-03 Revised:1994-08-15 Online:1995-02-24 Published:1995-02-24

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摘要： 探讨了焙烧温度对钙钛矿型复合氧化物LaTi1-yLiyO3-λ(0≤y<1)为主要物相的LiLa0.5Ti0.5O2+λ催化剂的结构及甲烷氧化偶联反应活性的影响机制,用XRD、IR、XPS和BET等方法对催化剂进行表征.结果表明,焙烧温度对催化剂的OCM反应活性的影响是双重的.提高焙烧温度有利于Li+进入LaTiO3晶格(或间隙)产生更多数量的氧空位,进而产生更多的活性氧种,有利于OCM反应的进行,但过高的焙烧温度又使催化剂的结构(或物相)发生变化,因而使Li+的取代量、比表面积和甲烷转化率均下降.

关键词: 甲烷氧化偶联, 焙烧温度, 钛镧理钙钛矿型氧化物

Abstract: The correlations of the calcination temperature,structure and catalytic activity for the oxidative coupling of methane on the LiLa0.5Ti0.5O2+λcatalysts whose main phase and major active phase is Perovskite-type ternary complex oxide LaTi1-yLiyO3-λhave been studied.The surface and bulk structures of the catalysts were characterized by means of XRD,XPS,IR,BET and so on.The results cleary indicated that the effect of calcination temperature on the activity for the oxidative coupling of methane is twofold.On one hand, it is favorable for Li+substitution for Ti3+to enter into the lattice of LaTiO3and produce more oxygen vacancies in which active oxygens are formed;however,excessively high calcination temperature make the amount of Li+substitution for Ti3+lower,due to a little change of structure or phases for the catalyst.On the other hand,the conversion of CH4drops because of the decrease of surface area,when the calcination temperature is raised.

Key words: Oxidative coupling of methane, Calcination temperature, Titanium-lanthanumlithium perovskite oxide

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