Structural modification of zirconia and its influence on the catalytic activity

XRD, DTA and specific surface area measurements were employed to study the structural properties of ZrO2 and sulphate-modified ZrO2 calcined at different temperatures. Calcination facilitates the transformation of ZrO2 from cubic to monoclinic phase. Addition of SO4 ion to Zr(OH)4 helps to retain th...

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Veröffentlicht in:	Journal of materials science 1995-01, Vol.30 (24), p.6355-6358
Hauptverfasser:	NARAYANAN, S, KRISHNAN, M. S, VISHWANATHAN, V
Format:	Artikel
Sprache:	eng
Schlagworte:	Catalysis Catalysts: preparations and properties Chemistry Exact sciences and technology General and physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Zusammenfassung:	XRD, DTA and specific surface area measurements were employed to study the structural properties of ZrO2 and sulphate-modified ZrO2 calcined at different temperatures. Calcination facilitates the transformation of ZrO2 from cubic to monoclinic phase. Addition of SO4 ion to Zr(OH)4 helps to retain the cubic phase up to 550 C, and to maintain the surface area through a surface complex formation mechanism. The modified ZrO2 acts as a superacid catalyst and enhances the vapour-phase aniline alkylation. 14 refs.
ISSN:	0022-2461 1573-4803
DOI:	10.1007/BF00369688