Effect of mechanochemical activation on the thermal reactions of boehmite (γ-AlOOH) and γ-Al2O3
作者： K.J.D MacKenzie , J Temuujin , M.E Smith , P Angerer , Y Kameshima
DOI: 10.1016/S0040-6031(00)00513-X
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摘要: Abstract Boehmite (γ-AlOOH) and γ-Al2O3 were ground for 60 min the changes in their structure thermal reactions monitored by X-ray powder diffraction, analysis 27Al MAS NMR. Grinding does not cause boehmite to dehydrate, but causes a decrease intensity of its reflections, formation an amorphous phase containing tetrahedral Al another site with resonance at 36 ppm (sometimes attributed pentacoordinated Al). The material thermally transforms corundum 940°C via γ-Al2O3, contrast unground control, which forms 1195°C γ δ-Al2O3. decreases reflections induces some without further heating. Complete transformation occurs 927°C, compared 1193°C relationship between mechanochemical development NMR aluminas hydroxyl adsorbed water content is discussed.
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