Zirconia as a support for catalysts: Evolution of the texture and structure on calcination in air

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Mercera, P.D.L. and Ommen van, J.G. and Doesburg, E.B.M. and Burggraaf, A.J. and Ross, J.R.H. (1990) Zirconia as a support for catalysts: Evolution of the texture and structure on calcination in air. Applied Catalysis, 57 (1). pp. 127-148. ISSN 0166-9834

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Abstract:Zirconia samples, prepared by precipitation from a solution of zirconyl chloride at a constant pH of 10, were calcined in flowing air at temperatures up to 850°C in order to study the development and stability of the porous texture in conjunction with the development of the structure of the resulting materials as a function of calcination temperature. The gel precipitation technique employed yields a high surface area zirconia (SBET of 111 m2g−1 after calcination at 450°C) with a well-developed mesoporous texture. The porous texture is, however, unstable under the experimental conditions employed, the initial high specific surface area being lost quite rapidly with increase in calcination temperature; calcination at 850°C brings about a reduction of the (BET) specific surface area by approximately 97%. Two process were identified as being responsible for the changes in pore structure and surface area: (i) crystallite growth and an accompanying phase transformation; and (ii) inter-crystallite sintering (neck-formation and growth); both these phenomena probably occur via a mechanism of surface diffusion. The inter-crystallite sintering process becomes more pronounced at higher calcination temperatures.
Item Type:Article
Copyright:© 1990 Elsevier
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Link to this item:http://purl.utwente.nl/publications/72908
Official URL:http://dx.doi.org/10.1016/S0166-9834(00)80728-9
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