物理化学学报 >> 1999, Vol. 15 >> Issue (11): 1001-1004.doi: 10.3866/PKU.WHXB19991109

研究论文 上一篇    下一篇

Ni-Mo氧化物超细粒子催化剂的制备与表征

卞国柱, 韩波, 伏义路   

  1. 中国科学技术大学化学物理系,合肥 230026
  • 收稿日期:1999-02-10 修回日期:1999-04-08 发布日期:1999-11-15
  • 通讯作者: 卞国柱

Sol-gel Method Preparation and Characterization of NiMoO4 Ultrafine Particle Catalyst

Bian Guo-Zhu, Han Bo, Fu Yi-Lu   

  1. Department of Chemical Physics,University of Science and Technology of China,Hefei 230026
  • Received:1999-02-10 Revised:1999-04-08 Published:1999-11-15
  • Contact: Bian Guo-Zhu

摘要:

以柠檬酸为络合剂,采用溶胶-凝胶法制备NiMoO4超细粒子催化剂. 使用DTA、BET比表面测定、XRD和LRS等表征手段考察了热处理条件和焙烧温度对粒子结构的影响. 结果表明, 在氩气气氛中于210℃分解干凝胶中的柠檬酸, 可以避免柠檬酸分解时燃烧大量放热而引起超细微粒的烧结, 脱除柠檬酸后的超细粉末为NiMoO4. 经400℃以上的高温处理后,微粒明显晶化.

关键词: Ni-Mo复合氧化物, 超细微粒的制备, 溶胶-凝胶法

Abstract:

Ni Mo ultrafine particle samples have been prepared by sol gel method with citric acid as complexant. DTA, BET, XRD and LRS have been employed to characterize the structures of the samples obtained by calcining the Ni-Mo gel at various temperatures. The results show that when the Ni Mo gel is calcined in air at 210 ℃, citric acid reacts violently with O2, it produces a flash heat and results in an aggregation of the Ni-Mo particles. When the gel is calcined in argon, citric acid is removed mildly and NiMoO4 ultrafine particles are formed. After calcined at 500 ℃, the ultrafine particles grow up with a decrease of BET surface area from 51.5 m2•g-1 to 25.0 m2•g-1.

Key words: Ni-Mo complex oxide, Preparation of ultrafine particles, Sol-gel method