Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (11): 1001-1004.doi: 10.3866/PKU.WHXB19991109

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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

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