催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (2): 165-170.

• 研究论文 • 上一篇    下一篇

钼和钨在氧化铝表面的分散特性

李会峰,李明丰,褚阳,夏国富,聂红   

  1. 中国石油化工股份有限公司石油化工科学研究院, 北京 100083
  • 收稿日期:2009-02-25 出版日期:2009-02-25 发布日期:2012-11-21

The Dispersion Characteristics of Molybdenum and Tungsten on Alumina Surface

LI Huifeng, LI Mingfeng*, CHU Yang, XIA Guofu, NIE Hong   

  1. Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China
  • Received:2009-02-25 Online:2009-02-25 Published:2012-11-21

PDF

1257

被引次数

15

摘要： 以低温(873 K)和高温(1173K)焙烧的氧化铝为载体制备了一系列负载钼和/或钨催化剂,结合X射线衍射、红外光谱、氨溶实验、氢气程序升温还原表征以及4,6-二甲基二苯并噻吩加氢脱硫性能评价,研究了钼和钨在氧化铝表面分散的特性. 结果发现,钼倾向与碱性羟基和中性羟基作用,而钨优先与中性羟基作用. 钼的引入促进了钨的还原. 氨溶后残余的钼钨物种虽然与载体的作用较强,但经焙烧后它们在载体表面重新再分散,达到新的热力学或能量平衡.

关键词: 钼, 钨, 氧化铝, 分散

Abstract: After the ammonia extraction, polymeric Mo (W) species (easily forming active Mo S2(WS2) after sulfiding) and bulk MoO3(WO3) were removed, wh ile the residual metal species still have a strong interaction with alumina surf a ce. However, by further calcination, a new equilibrium, depending on th e surface characteristics of alumina, can be reached by their redispersion on al umina surface.

Key words: molybdenum, tungsten, alumina, dispersion