石油炼制与化工

• 基础研究 • 上一篇    下一篇

不同扩孔方法对催化剂载体氧化铝孔结构的影响

李广慈 赵会吉 赵瑞玉 刘晨光   

  1. 中国石油大学化学化工学院 中国石油大学 中国石油大学 中国石油大学(华东)化学化工学院
  • 收稿日期:2009-05-15 修回日期:1900-01-01 出版日期:2010-01-12 发布日期:2010-01-12
  • 通讯作者: 赵瑞玉

EFFECTS OF VARIOUS PORE-ENLARGING METHODS ON THE PORE STRUCTURE OF ALUMINA CATALYST SUPPORT

LIU Chen-Guang   

  • Received:2009-05-15 Revised:1900-01-01 Online:2010-01-12 Published:2010-01-12

摘要: 分别采用扩孔剂法和水热处理法对氧化铝载体进行处理,考察不同扩孔方法对氧化铝载体孔结构的影响。结果表明,采用不同的扩孔剂对氧化铝孔结构影响不同。扩孔剂聚丙烯酰胺加入量(w)为15%,800 ℃焙烧后可得到平均孔径为14.3 nm的氧化铝载体;加入一定量的扩孔剂NH4HCO3,控制n(HCO-3)/n(Al3+)=0.75,经高温焙烧后可制得平均孔径为10 nm的介孔氧化铝;在140 ℃下对氧化铝进行水热处理,发现不同的水热处理时间对氧化铝孔结构有显著影响;同时孔结构随焙烧温度的不同呈规律性的变化。

关键词: 氧化铝载体, 扩孔剂, 水热处理, 孔结构

Abstract: Alumina support was treated by adding pore-enlarging additives and hydrothermal treatment respectively to study the effects of various pore-enlarging methods on the pore structure of alumina. Results indicated that the pore structure of alumina varied with the various pore-enlarging additives. An alumina support having an average pore size of 14.3 nm was prepared by adding 15 wt% of polyacrylamide (PAM) and calcined at 800℃ for 4h. Alumina support with an average pore size of about 10 nm was obtained by adding NH4HCO3 at a n(HCO-3)/n(Al3+) of 0.75. It was found that the treating time had significant effect on the pore structure of alumina when hydrothermal treating alumina at 140 ℃, and the pore structure of alumina changed with the calcination temperature as well.

Key words: alumina carrier, pore-enlarging additive, hydrothermal treatment, pore structure