Reactivity of δ‐ and θ‐ Al 2 O 3  for ZnAl 2 O 4  formation | Zendy

Tsuchida T. | Zendy; Furuichi R. | Zendy; Ishii T. | Zendy

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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.

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