Kinetics of hydrogen reduction of sodium sulfate mixed with sodium titanate | Zendy

Zou X. | Zendy; Avedesian M. M. | Zendy; van Heiningen A. R. P. | Zendy

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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.

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