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The thermal transformation of Gelatinous Aluminium Hydroxide
Author(s) -
Sato Taichi
Publication year - 1972
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19723910210
Subject(s) - boehmite , aluminium hydroxide , bayer process , aluminium , hydroxide , amorphous solid , aqueous solution , materials science , inorganic chemistry , aluminium chloride , chemical engineering , chemistry , nuclear chemistry , composite material , organic chemistry , engineering
The thermal transformation of the gelatinous aluminium hydroxides (amorphous and pseudoboehmite) prepared from aqueous aluminium chloride solution on addition of sodium hydroxide at various pH, have been studied by X‐ray diffraction, infrared spectra and thermal analyses. As a result, it is concluded that the gelatinous aluminium hydroxides transform thermally as follows: amorphous aluminium hydroxide → amorphous alumina →γ‐alumina → θ‐alumina → α‐alumina, pseudoboehmite → γ‐alumina → θ‐alumina → α‐alumina. Further the thermal transformation of bayerite, prepared from the aqueous solution at higher pH, and of boehmite, prepared hydrothermally from gelatinous aluminium hydroxide, have been investigated in comparison with those of gelatinous aluminium hydroxide.