Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/91722
Title: The influence of preparation conditions on the surface area of zirconia
Authors: Chuah, G. K.
Jaenicke, S.
Chan, K. S.
Cheong, Siew Ann
Keywords: DRNTU::Science::Chemistry::Physical chemistry
Issue Date: 1996
Source: Chuah, G. K., Jaenicke, S., Cheong, S. A., & Chan, K. S. (1996). The influence of preparation conditions on the surface area of zirconia. Applied Catalysis A: General, 145(1-2), 267-284.
Series/Report no.: Applied catalysis A : general
Abstract: The conditions for preparation of high surface area zirconia were studied. Samples were prepared by precipitation from aqueous solutions of zirconium chloride with ammonium hydroxide. The order of addition of the reactants was found to affect the surface area. Digestion of the hydrous zirconia is the key to high surface area zirconia without the necessity of adding other oxides or dopants. Both the temperature and the time of digestion are important parameters. Zirconia with surface area in excess of 220 m2/g after calcination at 500°C have been obtained. The materials maintained a surface area of > 90 m2/g even after heat treatment at 900°C for 12 h. In addition, digestion led to the formation of the tetragonal allotrope of zirconia. Samples which had been digested for long times at 100°C are tetragonal and maintain this phase up to 1000°C. The effects of digestion seems to be related to a phase transformation of the hydrous precursor at around 80°C. A mechanism based on defect density is postulated to explain the phase stability.
URI: https://hdl.handle.net/10356/91722
http://hdl.handle.net/10220/4591
ISSN: 0926-860X
DOI: 10.1016/0926-860X(96)00152-4
Rights: Applied Catalysis A: General © 1996 Published by Elsevier B.V. The journal's website is located at http://www.sciencedirect.com.ezlibproxy1.ntu.edu.sg/science/journal/0926860X
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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