Review of researches on H2S splitting cycle for hydrogen production via low-temperature route

Li, Xiaoling; Zhang, Ke; Chang, Liping; Wang, Hui

doi:10.1016/j.cesx.2021.100107

Cited by 4 publications

(4 citation statements)

References 40 publications

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“…[36] It has been noted previously that in the 2-step Claus process, the oxidization of H 2 S into S and H 2 O effectively wastes the protons that could be used for H 2 production because it requires less energy to abstract H 2 from H 2 S compared to H 2 O. [37][38][39][40] This has motivated the development of numerous methods to decompose H 2 S to liberate the H 2 , including direct thermal decomposition, electrolysis, indirect decomposition with iodine, and others. [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] However, to date, none of these alternative methods have achieved large-scale industrial implementation due to significant technical challenges.…”

Section: Presentation Of Msw-to-h 2 Cyclementioning

confidence: 99%

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Bachman,

Hamers

2024

Preprint

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Chemical fuel production from biomass represents one method for decarbonizing the global energy infrastructure. However, current technologies have significant drawbacks that limit application to select feedstocks. For example, the endothermic steam-reforming process is limited to gasified low-sulfur feedstocks that have thus far precluded the economic utilization of municipal solid wastes (MSW) among other sources of biomass. The use of elemental S is one potential method to utilize these organic wastes for H2 production through the high-temperature and exothermic production of hydrogen sulfide (H2S) and carbon disulfide (CS2) gasses as chemical intermediates. These reduced sulfur species are thermodynamically unstable with respect to their oxygen-analogs, which indicates that usable chemical energy may be derived from their oxidation. When biomass is dehydrogenated with S at lower temperatures, the formation of CS2 is suppressed and sulfurized biochar is produced. In this work, we describe and analyze a possible cyclic route to producing H2 from these species through the use of well-known chemical reactions operating in continuous fashion using cellulose as an example molecule. This “sulfur-reforming” process and additional steps may allow for the economical valorization of currently unutilized organic matter in MSW that may be contributing to environmental harm. If the sulfurized biochar is left sequestered, such as through use as a soil-amendment, and if the electrical energy is sourced from renewables, this process may be considered carbon-negative.

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Section: Presentation Of Msw-to-h 2 Cyclementioning

confidence: 99%

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Bachman,

Hamers

2024

Preprint

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“…In addition, the conventional desulfurization processes still recover only sulfur from H 2 S. The hydrogen (clean and renewable energy) stored in the H 2 S cannot be recovered from these technologies . To improve the utilization efficiency of the H 2 S, the H 2 S splitting method (H 2 S → H 2 + S) has been developed, which can simultaneously recover the sulfur and the hydrogen resources. − However, the reversible nature of this reaction severely impedes the H 2 S conversion thermodynamically and kinetically. Because of the thermal equilibrium limitation, the H 2 S equilibrium conversion is low, even at a high reaction temperature (e.g., only 20% at 1010 °C) .…”

Section: Introductionmentioning

confidence: 99%

Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

Zheng,

Lei,

Wang

et al. 2023

ACS Catal.

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Hydrogen sulfide (H 2 S) is a notorious and lethal gas widely generated in human economic activities and natural occurrences. The growing demand for pollution control makes it vital for the development of efficient processes to remove and convert H 2 S into high-valued products. As such, diversified technologies have been extensively explored, including H 2 S splitting, selective oxidation of H 2 S, and simultaneous conversion of H 2 S and CO 2 . In this review, the state-of-the-art processes for H 2 S conversion and utilization are reviewed. The potentials of various value-added products from H 2 S utilization, such as H 2 , syngas, COS, CH 3 SH, and other sulfur-containing fine chemicals are elucidated in detail. Notably, the traditional and emerging materials for H 2 S removal, mainly including metal oxide catalysts and carbon-based materials are also overviewed in this review. In addition, the catalytic mechanisms for these desulfurization reactions are also briefly discussed. Lastly, perspectives are given on the viability and technological gaps for each technology and corresponding catalysts.

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“…Sweetening of hydrogen sulfide and production of carbon dioxide are two of the most important factors in crude oil refineries and petrochemical industry processes. 1 Sulfur has a wide range of applications, including the production of vitriol, chemical organics and minerals, manures, explosives, rayon, reagents, color softeners, rubber, matches, and phosphate fertilizers. Therefore, recovery of sulfur from acid gases in a refinery is quite advantageous.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a High-Pressure Reactive Furnace in Recovering Sulfur from Sour Gas

Eskandarzadeh,

Akbari,

Yazdi

et al. 2023

ACS Omega

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Nowadays, the Claus process is one of the most efficient procedures to recover sulfur from acid gases. In the current study, the effect of working pressure and the role of initial species (sour gas, ammonia, carbon dioxide, hydrocarbon, nitrogen, and oxygen) are analyzed using COMSOL software. The reaction occurs between acid gases, which contain 88% H 2 S, 10.5% CO 2 , 0.49% N 2 , and 1.01% CH 4 in terms of molar percentage, and pure air. A good agreement is obtained between the numerical simulation results and experimental data. According to the results, there is a direct correlation between the conversion rate of acid gases and the increase in pressure. However, this rise in reactor pressure also leads to an undesirable increase in the outlet temperature. It is also observed that reduction of hydrogen sulfide inflow decreases the sulfur monoxide production rate, which in turn significantly affects the reactor temperature and the sulfur recovery rate. The more the oxygen that enters the reactor, the more the hydrogen sulfides that change into sulfur.

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Review of researches on H2S splitting cycle for hydrogen production via low-temperature route

Cited by 4 publications

References 40 publications

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts

Numerical Simulation of a High-Pressure Reactive Furnace in Recovering Sulfur from Sour Gas

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Review of researches on H2S splitting cycle for hydrogen production via low-temperature route

Cited by 4 publications

References 40 publications

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Advances in Resources Recovery of H2S: A Review of Desulfurization Processes and Catalysts

Numerical Simulation of a High-Pressure Reactive Furnace in Recovering Sulfur from Sour Gas

Contact Info

Product

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Advances in Resources Recovery of H₂S: A Review of Desulfurization Processes and Catalysts