高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (11): 1573.

• 研究论文 • 上一篇    下一篇

Li-Ni-La-O系复合氧化物催化剂上甲烷氧化偶联的研究

刘宝春, 远松月, 王连驰, 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:1992-12-29 修回日期:1993-03-01 出版日期:1993-11-24 发布日期:1993-11-24
  • 通讯作者: 远松月.
  • 作者简介:刘宝春, 男, 28岁, 硕士, 讲师.
  • 基金资助:

    国家自然科学基金

Oxidative Coupling of Methane over Li-Ni-La-O Catalysts

LIU Bao-Chun, YUAN Song-Yue, WANG Lian-Chi, YU Zuo-Long   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun, 130022
  • Received:1992-12-29 Revised:1993-03-01 Online:1993-11-24 Published:1993-11-24

PDF (PC)

被引次数

9

摘要： 考察了Li-Ni-La-O系催化剂的组成、结构及反应条件对甲烷氧化偶联反应活性的影响.在780℃、CH4:O2:N2=2:1:7、空速15000h-1时,C2烃收率可达25.8%.XRD、IR、XPS及SEM等的结构分析表明,在LiLa1-xNixO2催化剂中,当0.1≤x≤0.9时,该催化剂由LiNiO2和LaNi1-yLiyO4-λ两相组成,x<0.3时出现了LiLaO2相,La2Ni1-yLiyO4-λ是甲烷氧化偶联的主要活性相,活性位Li+-O--Ni2+数量的增加是活性提高的主要原因.LiNiO2和LiLaO2也有催化活性,它们与La2Ni1-yLiyO4间的协同作用也可能是催化活性增强的原因.

关键词: 甲烷, 氧化偶联, 锂镍镧氧化物

Abstract: The oxidative coupling of methane was studied over the Li-Ni-La-Omixed oxide cata-lysts.The effects of the catalyst composition and the reaction conditions on the activited of catalysts were examined.Ahigher C2 yield of 25.8% was obtained at 780℃ and 15000 h-1.The surface and bulk structures of the catalysts were characterized by means of XRD, IR, XPS, SEM.The results clearly indicate that in the series of catalysts LiLa1-xNixO2, when 0.1≤ x≤0.95 the catalyst was composed of two phases La2Ni1-yLiyO4-λ and LiNiO2 When x<0.3, LiLaO2 phase appeared.Among them La2Ni1-yLiyO4X possessed much higher catalytic activity for methane-oxidative coupling.The increase of the content of active site Li+-O--Ni2+ was the main factor for increasing the catalytic activity of methane-oxidative coupling.The synergeatic effect of different phases in the catalysts is also supposed.

Key words: Methane, Oxidative coupling, Lithium-nickel-lanthanum oxide (Ed.: Y, X)

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