催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (3): 292-296.

• 研究论文 • 上一篇    下一篇

Ni-Mo2N/SiO2复合纳米催化剂的制备及其对四氢萘加氢的催化活性

王智强,张明慧,李伟,陶克毅   

  1. 南开大学化学学院材料化学系新催化材料科学研究所, 天津 300071
  • 收稿日期:2008-03-25 出版日期:2008-03-25 发布日期:2012-03-01

Synthesis of Ni-Mo2N/SiO2 Nanocomposite Catalyst and Its Catalytic Activity for Tetralin Hydrogenation

WANG Zhiqiang, ZHANG Minghui*, LI Wei, TAO Keyi   

  1. Institute of New Catalytic Materials Science, Department of Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2008-03-25 Online:2008-03-25 Published:2012-03-01

PDF

900

被引次数

12

摘要： 采用程序升温氮化法制备了Mo2N/SiO2, 在此基础上负载Ni盐,制备了Ni-Mo2N/SiO2复合纳米催化剂,并考察了催化剂对四氢萘加氢的催化活性. 结果表明,与Ni2Mo3N/SiO2及Ni/SiO2催化剂相比, Ni-Mo2N/SiO2复合催化剂具有较高的催化活性. 采用“分离床”方法研究了Ni和Mo2N对四氢萘加氢活性的影响. 通过X射线粉末衍射、透射电镜、氢吸附、元素分析和比表面积测定等技术对Ni-Mo2N/SiO2催化剂进行了表征. 结果表明,与Ni/SiO2催化剂相比, Ni-Mo2N/SiO2复合催化剂中Ni的分散度并未提高; 催化活性的提高归因于Ni与Mo2N在四氢萘加氢中的协同作用. 氮化物的引入增加了芳烃吸附活性位的数目. 提出了四氢萘在Ni-Mo2N/SiO2催化剂上的可能加氢机理.

关键词: 镍, 氮化钼, 二氧化硅, 复合纳米催化剂, 四氢萘, 加氢

Abstract: Mo2N/SiO2 was prepared by a temperature-programmed nitridation method. The Mo2N/SiO2 was impregnated with Ni salt solution and then was directly reduced by H2 to prepare a new Ni-Mo2N/SiO2 nanocomposite catalyst. The catalyst was characterized byX-raydiffraction, transmission electron microscopy, H2 chemisorption, ICP-AES, and N2 adsorption-desorption techniques and evaluated by tetralin hydrogenation. The results showed that the new nanocomposite catalyst had higher tetralin conversion than the conventional Ni2Mo3N/SiO2 catalyst or Ni/SiO2 catalyst. The correlation between the active components (Ni and Mo2N) was also studied by the separated-bed method. The synergistic effect of Ni and Mo2N in the Ni-Mo2N/SiO2 catalyst promoted its catalytic activity for tetralin hydrogenation, where Mo2N provided more adsorption sites for aromatics. The possible hydrogenation process of tetralin over the Ni-Mo2N/SiO2 catalyst was proposed.

Key words: nickel, molybdenum nitride, silica, nanocomposite catalyst, tetralin, hydrogenation