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Synthesis of Thermally Stable χ‐Alumina by Thermal Decomposition of Aluminum Isopropoxide in Toluene
Author(s) -
Mekasuwandumrong Okorn,
Kominami Hiroshi,
Praserthdam Piyasan,
Inoue Masashi
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01543.x
Subject(s) - thermal decomposition , thermal stability , amorphous solid , materials science , toluene , chemical engineering , aluminium , decomposition , yield (engineering) , chemistry , metallurgy , organic chemistry , engineering
Thermal decomposition of aluminum isopropoxide in toluene at 315°C resulted in χ‐alumina that had high thermal stability, whereas the reaction at lower temperatures resulted in formation of an amorphous product. The χ‐alumina thus obtained directly transformed to α‐alumina at ∼1150°C, bypassing the other transition alumina phases, whereas the amorphous product transformed to γ‐alumina and then to θ‐alumina before final transformation to α‐alumina. When the χ‐alumina, solvothermally synthesized at 315°C, was recovered by the removal of the solvent at the reaction temperature, thermal stability of the product was improved further. This procedure is convenient because it avoids bothersome work‐up processes that yield large‐surface‐area and large‐pore‐volume alumina.