Thermodynamic aspects of gasification derived syngas desulfurization, removal of hydrogen halides and regeneration of spent sorbents based on La2O3/La2O2CO3 and cerium oxides

[Display omitted] •Equilibrium concentrations of H2S, COS, HCl and HF are computed for solid sorbents.•The solid sorbents are based on pure solids: ZnO, cerium oxides, La2O3 and La2O2CO3.•Interferences of HCl and HF in de-H2S reactions are determined (T=500–1100K).•Minimization of Gibbs free energy...

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Bibliographic Details
Published in:Fuel (Guildford) 2017-06, Vol.197, p.277-289
Main Authors: Svoboda, Karel, Leitner, Jindřich, Havlica, Jaromír, Hartman, Miloslav, Pohořelý, Michael, Brynda, Jiří, Šyc, Michal, Chyou, Yau-Pin, Chen, Po-Chuang
Format: Article
Language:English
Subjects:
Cerium oxides
Dehalogenation
Desulfurization
La2O3/La2O2CO3
Regeneration
Thermodynamics
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Summary:[Display omitted] •Equilibrium concentrations of H2S, COS, HCl and HF are computed for solid sorbents.•The solid sorbents are based on pure solids: ZnO, cerium oxides, La2O3 and La2O2CO3.•Interferences of HCl and HF in de-H2S reactions are determined (T=500–1100K).•Minimization of Gibbs free energy for the complex systems is used.•Possibilities of La2O2S and Ce2O2S regenerations are assessed. The thermodynamic analyses are focused on the determination of theoretical equilibrium concentrations of H2S, HCl and HF for La2O3, La2O2CO3 and CexOy-based sulfur compounds sorbents, on possible interferences of hydrogen halides in H2S removal in the temperature range 600–1100K and on upstream selective deep removal of HCl and HF in producer gas. Minimization of Gibbs energy for the system was used in more complicated situations. The lowest H2S concentration (
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2016.12.035