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Reactivity of δ‐ and θ‐ Al 2 O 3 for ZnAl 2 O 4 formation
Author(s) -
Tsuchida T.,
Furuichi R.,
Ishii T.
Publication year - 1976
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.19764230212
Subject(s) - reactivity (psychology) , boehmite , activation energy , chemistry , mineralogy , materials science , analytical chemistry (journal) , aluminium , organic chemistry , medicine , alternative medicine , pathology
The rate of ZnAl 2 O 4 formation was measured for δ‐ and θ‐A1 2 0 3 in order to distinguish the reactivity of them. The reaction rate fitted to JANDER' equation and the activation energy calculated were 53 Kcal/mol for θ‐A1 2 0 3 system and 73, 79, 57, 71 Kcal/mol for δ‐A1 2 0 3 (l), (2), (3), (4) systems, respectively. The fact that θ‐A1 2 0 3 shows very high reactivity compared with that of δ‐A1 2 0 3 was found to result from the larger specific surface area of θ‐A1 2 0 3 . The reactivity of δ‐A1 2 0 3 changed by the conditions of preparation of boehmite which is a starting material of alumina.