Decomposition of hydrogen sulfide into elements in the cyclic chemisorption-catalytic regime

Zagoruiko, Andrey N.; Микенин, П. Е.

doi:10.1016/j.cattod.2020.12.004

Cited by 13 publications

(5 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At 600 °C, the yield in H 2 was 14% and 18% for Na 2 S and K 2 S, respectively. In another investigation by Zagoruiko and Mikenin, the chemisorption capacity was reported for FeS, CoS, and NiS as 9.7%, 7.9%, and 5.0%, respectively. These results demonstrated that the low and high sulfide couples recommended by the computational work have a good agreement with the experimental data.…”

Section: Screening Results and Discussionmentioning

confidence: 92%

“…The work by Zagoruiko and Mikenin confirmed that the decomposition of H 2 S becomes visible starting from 200 °C and rises as the temperatures increase. 20 The presence of H 2 in the gas product was also detected by taking samples with a gas sampling bag, and tests were run in another separated gas chromatography with a thermal conductivity detector, but the quantification was not successfully conducted due to the loss of H 2 from the bag before analysis even though the representative peak for H 2 was observed. The complete H 2 S conversion displayed at the earlier stage of the reaction was due to the excess available sites for adsorption and surface reaction capable of accommodating all the H 2 S molecules at that point.…”

Section: Resultsmentioning

confidence: 99%

“…Temperatures from 200 to 500 °C display complete H 2 S conversion at an early stage with a maximum decomposition of 90 mg H 2 S/g Ni 3 S 2 at 500 °C. The work by Zagoruiko and Mikenin confirmed that the decomposition of H 2 S becomes visible starting from 200 °C and rises as the temperatures increase . The presence of H 2 in the gas product was also detected by taking samples with a gas sampling bag, and tests were run in another separated gas chromatography with a thermal conductivity detector, but the quantification was not successfully conducted due to the loss of H 2 from the bag before analysis even though the representative peak for H 2 was observed.…”

Section: Experimental Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting

Osasuyi

Quang

Basina

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Two-step thermochemical H 2 S splitting process is a promising method to recover both H 2 and S from a toxic waste H 2 S gas via low/high metal sulfide conversion. Several studies have examined the potential of the process experimentally. Still, there is a lack of comprehensive research into such as to provide a guideline for selecting the appropriate metal for the process. The most common metals in the periodic Table (28 metals) have been examined to find stable low/high metal sulfide couples. A list consisting of 17 metals that can form thermodynamically stable couples has been shortlisted, in which six metals: K, Zr, Hf, Nb, Fe, and Ni, were found to be promising candidates with a high H 2 S splitting efficiency, high H 2 yield and good reversible transition between low and high sulfides. The transition between sulfide crystals has been experimentally demonstrated with the Ni 3 S 2 /Ni 3 S 2+x couple. This couple can decompose up to 90 mg H 2 S/g-Ni 3 S 2 at 500 °C to produce H 2 and high sulfides Ni 3 S 2+x that was successfully regenerated at 700 °C for multiple cycles. The thermodynamic calculations revealed that the sulfides of Zr, Hf, and Nb are favorable for the two-step H 2 S splitting process, but have not been explored experimentally. The sulfide of Zr was examined in this work, but they got oxidized by residual oxygen in the test gas before the crystalline transition was detected and remained as a challenge in the future works.

show abstract

Section: Screening Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting

Osasuyi

Quang

Basina

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…It is problematic in industrial processes because it poisons catalysts and readily corrodes metallic equipment and pipelines. Accordingly, removal of H 2 S from industrial gas streams is an indispensable step in areas such as semiconductor manufacture, high quality oil gas and green catalysis (Zagoruiko et al, 2021). Adsorption is the most commonly used method to remove H 2 S from gas streams containing concentrations typically below 100 ppm.…”

Section: Introductionmentioning

confidence: 99%

Significance of micropores for removal of hydrogen sulfide from oxygen-free gas streams by activated carbon

Liu

Zuo

2022

Preprint

View full text Add to dashboard Cite

Activated carbon materials are widely used adsorbents for removal of hydrogen sulfide (H2S) during purification of gas streams. Five commercially available wood-, coal-, and coconut shell-based activated carbons, prepared by phosphoric acid activation and steam activation, were chosen as adsorbents. The removal of H2S by these materials was studied by plotting breakthrough curves to determine the effect of pore structure on H2S adsorption from an oxygen-free gas stream. Conventional catalyst-loaded activated carbons were not as effective under these conditions compared with H2S removal from an oxygen-containing stream. The results showed that adsorption of H2S by activated carbon under oxygen-free conditions was dependent on the microporous structure, particularly micropores with size of 1 nm. The H2S breakthrough capacity of CS-3 was 0.026 g/cm3 under oxygen-free conditions. Compared with conventional KOH- and CuO-loaded activated carbons, the steam activated materials with highly developed micropore structures were better adsorbents for H2S removal because of their high adsorption capacities and reduced fire risk. Moreover, it was found that pre-adsorption or co-adsorption of carbon tetrachloride led to poisoning of the activated carbon for H2S adsorption.

show abstract

“…Recently, Zagoruiko and Mikenin [91] studied sulfides of transient metals (Fe, Co, and Ni) both in bulk and supported forms. They observed highest efficiency with bulk sulfides NiS, CoS, and FeS, with the conversion of H 2 S and the yield of H 2 higher than the equilibrium values for direct H 2 S decomposition reaction.…”

mentioning

confidence: 99%

Waste to H2 Sustainable Processes: A Review on H2S Valorization Technologies

Spatolisano,

Restelli,

Pellegrini

et al. 2024

Energies

View full text Add to dashboard Cite

In the energy transition from fossil fuels to renewables, the tendency is to benefit from ultra-sour natural gas reserves, whose monetization was previously considered unviable. The increasing H2S content together with the growing concern about emissions that are harmful to the environment, make necessary the development of efficient strategies for pollutants management. Although large-scale H2S conversion is well-established through the Claus process, novel technologies for H2S valorization could be a reliable alternative for waste-to-valuable chemicals, following the circular economy. In this perspective, technologies such as Hydrogen Sulfide Methane Reformation (H2SMR), non-thermal plasma, photocatalytic decomposition, decomposition through cycles and electrolysis are analyzed for the H2 production from H2S. They represent promising alternatives for the simultaneous H2S valorization and H2 production, without direct CO2 emissions, as opposite to the traditional methane steam reforming. The various H2S conversion routes to H2 are examined, highlighting the advantages and disadvantages of each of them. This review focuses in particular on the most promising technologies, the H2SMR and the non-thermal plasma, for which preliminary process scheme and techno-economic analysis are also reported. Finally, the major research gaps and future developments necessary to unlock the full potential of hydrogen sulfide valorization as a sustainable pathway for hydrogen production are discussed.

show abstract

Decomposition of hydrogen sulfide into elements in the cyclic chemisorption-catalytic regime

Cited by 13 publications

References 94 publications

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting

Significance of micropores for removal of hydrogen sulfide from oxygen-free gas streams by activated carbon

Waste to H2 Sustainable Processes: A Review on H2S Valorization Technologies

Contact Info

Product

Resources

About

Decomposition of hydrogen sulfide into elements in the cyclic chemisorption-catalytic regime

Cited by 13 publications

References 94 publications

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H2S Splitting

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H2S Splitting

Significance of micropores for removal of hydrogen sulfide from oxygen-free gas streams by activated carbon

Waste to H2 Sustainable Processes: A Review on H2S Valorization Technologies

Contact Info

Product

Resources

About

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting

Reversible Metal Sulfide Transition in a Two-Step Thermochemical H₂S Splitting