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Article Dans Une Revue Chemical Engineering Journal Année : 2022

An experimental, theoretical and kinetic-modeling study of hydrogen sulfide pyrolysis and oxidation

Résumé

Hydrogen sulfide chemistry has recently undergone a renewed interest due to the current energy transition, requiring a proper treatment of such impurities in the sources like shale gas or biogas. Moreover, the lower-temperature, diluted conditions considered nowadays for reducing pollutant emissions require a wider-range development and validation of the pyrolysis and oxidation mechanisms. In this work, this was addressed through an experimental campaign carried out in three reactor facilities, namely a jet-stirred reactor and two flow reactors. A wide range of operating conditions could thus be covered, in terms of equivalence ratios under lean conditions (0.018 ≤ Φ ≤ 0.5), temperatures (400 K ≤ T ≤ 2000 K) and residence times (0.1 s ≤ τ ≤ 2 s). The mole fractions of reactants (H2S, O2), products (SO2, H2O) and intermediates (H2) were measured. In parallel, a kinetic mechanism of H2S pyrolysis and oxidation was developed by including the latest available kinetic rates on sulfur pyrolysis and oxidation chemistry, which were added to a core H2/O2 module, previously validated. Such a mechanism included a re-evaluation of selected key reaction steps, identified via sensitivity analysis. Results showed a general agreement of the experimental measurements with predictions: in the case of pyrolysis, the thermal decomposition reaction (H2S+M=H2+S+M) was identified as the sole controlling step: a critical choice of the kinetic rate had to be made, due to the significant disagreement among the literature rates. Concerning oxidation, the H-abstraction from H2S by O2 was found to be the major bottleneck at the lowest temperatures, with HO2 becoming a key abstractor, too, under very lean conditions. At higher temperatures, a key role was played instead by the H-abstraction of H2S with S (H2S+S=SH+SH), acting in the reverse direction and providing S radicals, boosting the oxidation process.
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2022 CEJ H2S.pdf (1.43 Mo) Télécharger le fichier
Oxidation Experimental data.xlsx (178.6 Ko) Télécharger le fichier
Pyrolysis Experimental Data.xlsx (58.15 Ko) Télécharger le fichier
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Dates et versions

hal-03806499 , version 1 (07-10-2022)

Identifiants

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Alessandro Stagni, Suphaporn Arunthanayothin, Luna Pratali Maffei, Olivier Herbinet, Frederique Battin-Leclerc, et al.. An experimental, theoretical and kinetic-modeling study of hydrogen sulfide pyrolysis and oxidation. Chemical Engineering Journal, 2022, 446 (1), pp.136723. ⟨10.1016/j.cej.2022.136723⟩. ⟨hal-03806499⟩
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