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The effect of curing on the thermal stability of Si-doped ZrO 2 powders
Journal article   Peer reviewed

The effect of curing on the thermal stability of Si-doped ZrO 2 powders

Q. Zhao, W.-H. Shih, H.-L. Chang and P. Andersen
Applied catalysis. A, General, v 262(2), pp 215-221
2004
DOI: https://doi.org/10.1016/j.apcata.2003.11.029

Abstract

Catalytic oxides Catalytic promoters Curing Si additive Surface area Thermal stability Three-way catalyst Zirconia powders
Curing (digestion) of hydrous zirconia in its mother basic solution at elevated temperatures increased the surface area and thermal stability of the zirconia powders. However, the curing studies on ZrO 2 performed by previous researchers were ambiguous because Si could dissolve from the glass container in basic condition during curing, thereby enhancing the surface area and thermal stability of ZrO 2 powders. In the current study the effects of curing and Si doping were separated by curing hydrous zirconia in a Teflon flask and by doping with different amounts of tetraethylorthosilicates (TEOS) solutions (0–10.9 wt.% Si in ZrO 2). We found that curing did increase the pore volume and the pore size of ZrO 2 powders but had negligible effect on the surface area of zirconia after 4 h of heat treatment at elevated temperatures. Si doping was found to significantly increase the surface area, delay the crystallization, stabilize the tetragonal phase of ZrO 2, and retard the crystallite growth. Curing was found to have a significant effect on the surface area of Si-doped ZrO 2.

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