Alumina gel, boehmite gel, ρ-alumina, η-alumina, and γ-alumina were treated with aqueous solutions of various inorganic and organic reagents at temperatures below 100°C. Boehmite gel, η-alumina and γ-alumina were found to show no change upon this treatment, while alumina gel and ρ-alumina either remained unchanged or changed into fairly well-crystallized boehmite, boehmite gel, gibbsite, bayerite, or nordstrandite, according to the treating conditions. It has been newly established that water-containing pyridine and aniline, the aqueous solution of hydrazine hydrate, and the aqueous solution of o, m-phenylenediamine are effective in forming fairly well-crystallized boehmite, nordstrandite, and gibbsite respectively.
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Yamaguchi et al. (1968) studied this question.