Comprehensive kinetic studies on isothermal and non-isothermal reactions of some aluminium compounds

J. Madarász, G. Pokol, C. Novák, H. Moselhy, S. Gál

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Residual differences after model fitting were investigated in both isothermal and non-isothermal kinetics in order to make numerical comparisons between several models and various parameter-estimating methods. Data from two independent experimental series were evaluated. A large data set, collected earlier under isothermal conditions from decompositions and hydrothermal reactions of aluminium hydroxides and oxides, was processed first. It showed that mechanical activation of the starting gibbsite affected reactivity of samples in several subsequent reactions for all model equations tried. The relative residual deviation concept is introduced, and statistics were applied to find a model that fits a certain reaction in most of the cases. In the second study, the sulphate decomposition step of aluminium sulphate octadecahydrate was investigated. TG curves were measured using a constant heating rate. Dynamic models were fitted by three mathematical methods, including a new general purpose one. Fitting ability of the methods with various complexity were compared on the basis of residual deviations obtained after integration of the model equations. As well as evaluating the best fit, this new parameter-estimating method provides a statistical analysis of the reliability of the whole model fitting process.

Original languageEnglish
Pages (from-to)1367-1378
Number of pages12
JournalJournal of Thermal Analysis
Volume40
Issue number3
DOIs
Publication statusPublished - Oct 1993

Fingerprint

Aluminum Compounds
Aluminum compounds
aluminum compounds
Kinetics
kinetics
sulfates
estimating
Decomposition
aluminum
deviation
decomposition
Hydrated alumina
Heating rate
dynamic models
statistical analysis
Sulfates
hydroxides
Dynamic models
Statistical methods
reactivity

Keywords

  • aluminium compounds
  • isothermal and non-isothermal reactions
  • parameter-estimating methods

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Engineering(all)

Cite this

Comprehensive kinetic studies on isothermal and non-isothermal reactions of some aluminium compounds. / Madarász, J.; Pokol, G.; Novák, C.; Moselhy, H.; Gál, S.

In: Journal of Thermal Analysis, Vol. 40, No. 3, 10.1993, p. 1367-1378.

Research output: Contribution to journalArticle

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