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化学学报
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化学学报 ›› 1999, Vol. 57 ›› Issue (7): 782-789. 上一篇    下一篇

研究论文

以水滑石类化合物为前体的Co-M-Al(M=过渡金属)复合氧化物 对催化消除NO~x活 性的研究

刘钰;杨向光;王学中;吴越   

  1. 中国科学院长春应用化学研究所.长春(130022)
  • 发布日期:1999-07-15

Preparation, charactreization, and catalytic properties of Co-M-Al (M=transition metal)mixed oxides derived from hydrotalcite-like compound

Liu Yu;Yang Xiangguang;Wang Xuezhong;Wu Yue   

  1. Changchun Inst Appl Chem., CAS.Changchun(130022)
  • Published:1999-07-15

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以共沉淀法制提得的水滑石类化合物为催化剂前体,经焙烧可得到一系列尖晶石类化合物Co-M-Al[M=Cr,Mn,Fe,Ni,Cu;n(Co):n(M):n(Al)=3:1:1].通过XRD,比表面测定,化学分析,NO吸附等方法对其进行表征,测定了此系列催化剂对NO催化还原和催化分解的活性,结果发现此系列催化对消除NO具有很高的活性.同时对催化消除NO的机理及过渡金属离子中d轨道电子对催化活性的影响进行了一些探讨。

关键词: 水滑石, 尖晶石, 氧化钴, 氧化铝, 氧化铬, 氧化锰, 氧化镍, 氧化铜, Ｘ射线衍射分析, 一氧化氮

Hydrotalcite-like compounds (HTLcs) CoMAlCO~3, where M stands for Cr, Mn,Ni,Cu,or Fe, were synthesized by coprecipitation. After calcination at 450^oC, they became mixed oxides with spinel-like structure. The mixed oxides were characterized by XRD, BET, chemical analysis and the adsorption of NO. The catalytic decomposition of NO and its reduction by CO were studied over these mixed oxides. The study showed that the catalytic activity for removal of NO~x was very high. The reaction mechanism is proposed and the effects of d-electrons of the transition metals on catalytic activity are elucidated.

Key words: HYDROTALCITE, SPINEL, COBALT OXIDE, ALUMINIUM OXIDE, CHROMIUM OXIDE, MANGANESE OXIDE, NICKEL OXIDE, COPPER OXIDE, X-RAY DIFFRACTION ANALYSIS, NITROGEN MONOXIDE

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