物理化学学报 >> 2015, Vol. 31 >> Issue (Suppl): 90-94.doi: 10.3866/PKU.WHXB2014Ac02

研究论文 上一篇    下一篇

钍对浸渍型和蛋壳型钴基催化剂Co/SiO2费托合成性能的影响

刘治华1, 余长春1, 杨盼2, 李然家1, 周红军1, 徐春明1   

  1. 1 中国石油大学(北京)新能源研究院, 北京102249;
    2 中国工程物理研究院材料研究所, 四川绵阳621700
  • 发布日期:2015-05-20
  • 通讯作者: 余长春 E-mail:yucc@cupb.edu.cn.cn
  • 基金资助:

    国家自然科学基金(21376263)资助项目

Effect of Thorium on Fischer-Tropsch Synthesis Performance over Impregnated and Eggshell Co/SiO2

LIU Zhi-Hua1, YU Chang-Chun1, YANG Pan2, LI Ran-Jia1, ZHOU Hong-Jun1, XU Chun-Ming1   

  1. 1 Institute of New Energy, China University of Petroleum (Beijing), Beijing 102249, P. R. China;
    2 Institute of Materials, China Academy of Engineering Physics, Mianyang 621700, Sichuan Province, P. R. China
  • Published:2015-05-20
  • Contact: YU Chang-Chun E-mail:yucc@cupb.edu.cn.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21376263).

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摘要：

分别采用浸渍和喷涂方法制备了浸渍型钴基催化剂(i-Co/SiO2)和蛋壳型催化剂(e-Co/SiO2), 添加锕系元素钍(Th)作为催化剂助剂, 利用X射线衍射(XRD)分析了催化剂晶相结构, H2程序升温还原(H2-TPR)表征了催化剂的还原性能, 一氧化碳加氢反应评价了催化剂的费托合成反应性能. 结果表明: 添加钍对浸渍型和蛋壳型两种催化剂均可提高重烃(C5+)的选择性, 抑制甲烷和轻烃的生成. 对于浸渍钴基催化剂, Th助剂可促进活性相的分散, 从而提高催化剂活性. 而对于蛋壳型钴基催化剂, Th助剂的添加可覆盖部分表面活性中心, 从而降低催化剂活性.

关键词: 钍, 钴基催化剂, 浸渍型催化剂, 蛋壳型催化剂, 费托合成

Abstract:

Modification of impregnated Co/SiO2 (i-Co/SiO2) and eggshell Co/SiO2 (e-Co/SiO2) through addition of thorium (Th) was obtained by impregnation and spray coating processes, respectively. The effects of thorium on the structure, reduction behavior, and catalytic performance were characterized by X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), and CO+H2 reaction. We found that the addition of Th in both impregnation and eggshell catalysts could improve selectivity towards heavy hydrocarbons (C5+) and suppress the formation of methane and light hydrocarbons. In impregnated Co/SiO2 catalysts, the presence of Th could promote dispersion of the active phase to enhance catalytic activity. However, when Th is added to eggshell Co/SiO2 catalysts, it may cover part of the active phase, leading to activity decline.

Key words: Thorium, Cobalt based catalyst, Impregnated catalyst, Eggshell catalyst, Fisher-Tropsch synthesis