Premium
Kinetics of hydrogen reduction of sodium sulfate mixed with sodium titanate
Author(s) -
Zou X.,
Avedesian M. M.,
van Heiningen A. R. P.
Publication year - 1994
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450720215
Subject(s) - nucleation , hydrogen , chemistry , inorganic chemistry , sodium sulfate , diffusion , kinetics , sodium , sulfate , hydrogen sulfide , thermogravimetric analysis , organic chemistry , thermodynamics , sulfur , physics , quantum mechanics
The hydrogen reduction kinetics of solid sodium sulfate mixed with sodium titanate are studied in a thermogravimetric system. The conversion‐time curves of the hydrogen reduction are sigmoidal in shape and are well described by the nucleation and growth model up to about 60% conversion. The reduction rate of this mixture is much faster than that of pure sodium sulfate. In the deceleratory conversion period, the reduction is controlled by gas diffusion through a product layer. Activation energies of 302 and 179 kJ/mol are obtained, respectively, for the nucleation and growth, and diffusion limited period. The influence of hydrogen concentration, steam concentration, sodium sulfate fraction, and sodium sulfide addition is also studied. A reaction mechanism is proposed for the hydrogen reduction in the solid state.