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Alumina-Promoted Sulfated Zirconia System:  Structure and Microstructure Characterization

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Dipartimenti di Chimica Fisica and Chimica, Università Ca'Foscari di Venezia, 30123 Venezia, Italy, Dipartimento di Chimica Fisica, Università di Padova, 35122 Padova, Italy, and Dipartimento di Chimica IMF, Università di Torino, 10125 Torino, Italy
Cite this: Chem. Mater. 2001, 13, 5, 1634–1641
Publication Date (Web):April 5, 2001
Copyright © 2001 American Chemical Society

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    The Al2O3 promotion of ZrO2/SO4 has been shown to influence n-butane isomerization activity. In this paper we report a study of the influence of a small addition of Al2O3 (0.6−10.3 wt %) onto the ZrO2 structure and microstructure. The addition of alumina is related to an increase of the surface area. A detailed X-ray diffraction analysis by the use of the modified Rietveld method allowed us to follow the changes in the crystalline phases and to quantify the amount of amorphous phase. When the Al2O3 content is increased, a decrease of the ZrO2 particle sizes is observed, paralleled by an increase of the amorphous phase. When the Al2O3 content is larger than 3.7 wt %, only amorphous phase can be detected. No crystalline peaks of Al2O3 were ever observed. These data were supported also by TEM and Raman measurements.

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     Dipartimento Chimica Fisica, Università Ca'Foscari di Venezia.

     Dipartimento di Chimica, Università Ca'Foscari di Venezia.


     To whom correspondence should be addressed:  Dipartimento di Chimica, Università Ca'Foscari di Venezia, Dorsoduro 2137, 30123 Venezia, Italy. E-mail:  [email protected]. Fax:  +39-041 257 8517.


     Università di Padova.

     Università di Torino.

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