The effect of Al(NO 3 ) 3 ·9H 2 O, AlCl 3 ·6H 2 O, Al(CH 3 COO) 3 , and NH 4 F on the specific surface of Al 2 O 3 obtained from aluminum‐ammonium alum by calcining was studied. It was found that the use of these additives makes it possible to obtain Al 2 O 3 with specific surface varying from 1 to 135 m 2 /g after thermal treatment in the interval from 1273 to 1423 K. The changes in the morphology and structure of powederd Al 2 O 3 obtained from alum containing these additives were studied by electron microscope observations.
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Bogdanov et al. (1986) studied this question.
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