期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 66, 期 3, 页码 803-813出版社
SPRINGER
DOI: 10.1023/A:1013148223203
关键词
crystallization; Friedmann; Kissinger kinetic analyses; Ozawa-Flynn-Wall; seeded alumina; solution effect
The phase transformation of seeded (5 mass% Fe2O3 as a Fe(NO3)(3) solution) boehmite derived alumina gel to alpha-Al2O3 was studied with DTA technique and compared with unseeded and alpha-Al2O3 seeded boehmite gels. Data for kinetic analysis of alpha-Al2O3 crystallization were obtained from quantitative DTA curves. The kinetic parameters were analysed by traditional Kissinger analysis and Friedman and Ozawa-Flynn-Wall methods using the Netzsch Thermokinetics program. Results of the comparison of values of activation energies for all three gels and methods are the process of alpha-Al2O3 transformation for originally gamma-AlOOH/Fe(NO3)(3) gels goes like that of unseeded boehmite gels, only under lower temperatures (lower about 200degreesC).
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