Journal of Materials Science

, Volume 29, Issue 13, pp 3441–3450 | Cite as

Phase composition and mechanism of formation of Ba-β-alumina-type systems for catalytic combustion prepared by precipitation

  • G. Groppi
  • C. Cristiani
  • P. Forzatti
  • M. Bellotto


A novel preparation method is proposed for Ba-β-Al203-type systems to be used in high-temperature catalytic combustion, consisting of precipitation in aqueous medium. Differential thermal analysis-thermogravimetry, X-ray diffraction, Fourier transform-infrared, TEM and surface area data are presented for Ba-Al-O samples with Al/Ba atomic ratios in the range 14-9 calcined at different temperatures up to 1670 K. The final materials consist of a barium-poor Ba-β1Al2O3 phase together with 1% α-Al2O3 in the case of Al/Ba = 14 and of a barium-rich Ba-β11-Al2O3 phase together with 2% BaAl2O4 in the case of Al/Ba = 9. A mono-phasic sample with a Ba-β-Al2O3 structure is obtained in the case of Al/Ba = 12; this phase is constituted by the simultaneous presence of both β1 and β11 structure types. Two routes operate above 1370 K in the formation of the Ba-β-Al2O3 phases involving solid-state reactions between γ-Al2O3 and BaAl2O4, and γ-Al2O3 and dispersed barium compounds. Based on the analogies between the structures of γ-Al2O3 and of the Ba-β-Al2O3 phases it is suggested that the formation of the latter occurs via diffusion of barium ions within oxygen close-packed planes of the γ-Al2O3-type spinel structure.


Barium Atomic Ratio Spinel Structure Simultaneous Presence Area Data 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • G. Groppi
    • 1
  • C. Cristiani
    • 1
  • P. Forzatti
    • 1
  • M. Bellotto
    • 2
  1. 1.Dipartimento di Chimica Industriale e Ingegneria Chimica “G. Natta” del PolitecnicoMilanoItaly
  2. 2.CISESegrate MilanoItaly

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