Formation of porous niobium pentoxide via phase transformation

Hong Yan Shang, Hua Mei, Xing Fu Zhou, Yi Qun Fan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Niobium(V) alkoxides were directly prepared in a undivided electrolytic cell by using niobium metal as sacrificing anode, then niobium(V) alkoxides were directly hydrolyzed to gel-like deposits. The phase transformation of the gel-like product by heat treatments resulted in the formation of porous niobium pentoxide. IR, TG-DSC, XRD and SEM were used to characterize the structure of porous Nb2O5 and the gel-like products. Studies show that amorphous Nb2O5 secondary particles change into orthorhombic phase and form 2 μm spherical particles after calcination at 873 K. While monoclinic Nb2O5 is obtained after calcination at 1 173 K, the porous Nb2O5 with pore size of about 250 nm is finally formed following the phase transformation of spherical Nb 2O5 particles into rod like particles.

Original languageEnglish
Pages (from-to)1812-1815
Number of pages4
JournalChinese Journal of Inorganic Chemistry
Volume24
Issue number11
StatePublished - Nov 2008

Keywords

  • Niobium pentoxide, porous structure
  • Niobium(V) alkoxides
  • Phase transformation

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