Improvement of Thermal Stability of Porous Nanostructured Ceramic Membranes

Yue Sheng Lin, Chih Hung Chang, Ramakrishnan Gopalan

Research output: Contribution to journalArticle

91 Scopus citations

Abstract

Unsupported crack-free lanthana-doped alumina and titania membranes and yttria-doped zirconia membrane were prepared by the sol-gel method. A novel solution-sol doping method was employed to coat the dopant oxide on the grain surface of these nanostructured ceramic membranes. The pore and phase structure data of these membranes after heat treatment from 450 to 1100 °C under an atmosphere of air and a steam/air mixture show a substantially improved thermal and hydrothermal stability of these doped ceramic membranes. Doping lanthana (in γ-alumina and titania membranes) and yttria (in zirconia membrane) raises the γ-alumina to α-alumina, anatase to rutile, and tetragonal zirconia to monoclinic zirconia phase transformation temperature by about 200 °C (for alumina), 150 °C (for titania) and 300 °C (for zirconia), respectively. At temperatures lower than the phase transformation temperatures, doping retards the surface area loss and pore growth of the three membranes. For the three ceramic membranes investigated, the effects of stabilizing the pore structure decrease in the following order: zirconia > titania > γ-alumina.

Original languageEnglish (US)
Pages (from-to)860-870
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Volume33
Issue number4
DOIs
StatePublished - Apr 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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