Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (12): 1098-1102.doi: 10.3866/PKU.WHXB19961210

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The Hydrothermal Behavior of Alumina IV. Rehydration of α-Al2O3

Ye Gang,Li Guang-Hui,Zhang Ming-Hai   

  1. Reseach Institute of Petroleum Processing,Beijing 100083
  • Received:1996-05-15 Revised:1996-07-22 Published:1996-12-15
  • Contact: Ye Gang

Abstract:

The rehydration of several α-Al2O3 has been investigated by means of XRD, DTA, TG and nitrogen adsorption methods. It is found that all α-Al2O3 samples are capable of rehydration at 250℃ and under saturated pressure. The rehydrated products depend on starting α-Al2O3. α-Al2O3 dehydrated at above 1000℃ rehydrates to boehmite; α-Al2O3 derived from diaspore at low temperatures rehydrates to diaspore. The quantitative analysis of the rehydration of α-Al2O3 has been studied.

Key words: Alumina, α-Al2O3, Corundum;Alumina hydrate, Boehmite, Diaspore, Rehydration, Phase transition