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Title: Improvement of thermal stability of porous nanostructured ceramic membranes

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 1,100 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 [gamma]-alumina and titania membranes) and yttria (in zirconia membrane) raises the [gamma]-alumina to [alpha]-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 > [gamma]-alumina.

Authors:
; ;  [1]
  1. Univ. of Cincinnati, OH (United States). Dept. of Chemical Engineering
Publication Date:
OSTI Identifier:
7108377
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research; (United States)
Additional Journal Information:
Journal Volume: 33:4; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; CRYSTAL-PHASE TRANSFORMATIONS; THERMODYNAMIC PROPERTIES; MEMBRANES; TITANIUM OXIDES; ZIRCONIUM OXIDES; DOPED MATERIALS; HEAT TREATMENTS; LANTHANUM OXIDES; PHASE STUDIES; PORE STRUCTURE; STABILITY; YTTRIUM OXIDES; ALUMINIUM COMPOUNDS; CHALCOGENIDES; LANTHANUM COMPOUNDS; MATERIALS; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; ZIRCONIUM COMPOUNDS; 360200* - Ceramics, Cermets, & Refractories

Citation Formats

Lin, Y S, Chang, C H, and Gopalan, R. Improvement of thermal stability of porous nanostructured ceramic membranes. United States: N. p., 1994. Web. doi:10.1021/ie00028a012.
Lin, Y S, Chang, C H, & Gopalan, R. Improvement of thermal stability of porous nanostructured ceramic membranes. United States. doi:10.1021/ie00028a012.
Lin, Y S, Chang, C H, and Gopalan, R. Fri . "Improvement of thermal stability of porous nanostructured ceramic membranes". United States. doi:10.1021/ie00028a012.
@article{osti_7108377,
title = {Improvement of thermal stability of porous nanostructured ceramic membranes},
author = {Lin, Y S and Chang, C H and Gopalan, R},
abstractNote = {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 1,100 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 [gamma]-alumina and titania membranes) and yttria (in zirconia membrane) raises the [gamma]-alumina to [alpha]-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 > [gamma]-alumina.},
doi = {10.1021/ie00028a012},
journal = {Industrial and Engineering Chemistry Research; (United States)},
issn = {0888-5885},
number = ,
volume = 33:4,
place = {United States},
year = {1994},
month = {4}
}