Hydrogen Production through Thermal Decomposition of Hydrogen Sulfide: Modification of the Sulfur Recovery Unit To Produce Ultrapure Hydrogen

Ghahraloud, Hossain; Farsi, M.; Rahimpour, Mohammad Reza

doi:10.1021/acs.iecr.8b01407

Cited by 16 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Facing traditional fossil fuels responsible for climate change and global warming, dihydrogen H 2 constitutes a clean energy carrier and sustainable alternative for meeting future energy demands . Nowadays, H 2 can be used either as an energy vector owing to its high mass energy density (123 MJ kg –1 ) or as a chemical reagent for the Haber–Bosch process . As an energy vector, it can be consumed into a fuel cell to produce electricity for mobility or to store the excess energy produced by intermittent and renewable energy sources .…”

Section: Introductionmentioning

confidence: 99%

Efficient and Highly Stable 3D-Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

Tourneur,

Joanny,

Perrin

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

Considered like a fully renewable and clean energy carrier with the highest energy density, dihydrogen (H 2 ) constitutes the best alternative to fossil fuels for ensuring the sustainability of energy. This technologically and industrially relevant energy vector can be produced by water electrolysis that is now widely recognized as an eco-friendly, scalable, and carbonfree route. In that context, alkaline water electrolysis is an affordable technology because it allows the use of transition metals as electrocatalysts for both hydrogen (HER) and oxygen (OER) evolution reactions. Here, combining catalytically active transition metal alloys (NiFe and NiCo) with a 3D printing technique, namely, selective laser melting (SLM), enables access to ca. 25 cm 2 microstructured cylindrical electrodes, efficiently promoting alkaline HER and OER. NiCo is found to be the most efficient electrode for HER, with an overpotential of 210 mV at 10 mA cm −2 . It is also the most stable electrode when studied in operation during prolonged electrolysis, with a potential change of only 40 mV after 140 h of electrolysis at 50 mA cm −2 (1.25 A). Regarding the OER, NiFe shows the highest catalytic activity with an overpotential of 300 mV at 10 mA cm −2 and the greatest stability in operation with an electrolysis-induced potential change of only 30 mV. Further surface characterization techniques (scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), contact angle measurements, and analysis of electrogenerated gas bubbles) are used to monitor the electrolysis-induced chemical changes and to get valuable information on the bubble dynamics. Interestingly, electrolysis is found to be beneficial for enhancing the hydrophilicity and/or the aerophobicity of the electrodes, thus facilitating the detachment of the H 2 or O 2 bubbles.

show abstract

Section: Introductionmentioning

confidence: 99%

Efficient and Highly Stable 3D-Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

Tourneur,

Joanny,

Perrin

et al. 2023

ACS Appl. Eng. Mater.

View full text Add to dashboard Cite

show abstract

“…In a recent proposal, Ghahraloud et al suggested a process to produce ultrapure H 2 by modifying the Claus process for the decomposition of H 2 S. 40 To enhance performance in the modified Claus process, coils and hydrogen-selective permeable tubular membranes were placed in both the furnace and catalytic reactors as shown in Figure 4. To produce H 2 , a coil furnace is used and the H 2 gas is directed through membrane reactors to eliminate contaminants from the gas stream.…”

Section: General Routes Of H 2 S Conversion To H 2 and Other Compoundsmentioning

confidence: 99%

Perspectives in the Synergetic Photothermocatalysis of Hydrogen Sulfide Decomposition for Hydrogen Production: A Comprehensive Review

Mulewa,

Tahir

2024

Energy Fuels

View full text Add to dashboard Cite

Acid gas, which contains toxic hydrogen sulfide, is produced by several sources, including refineries and processing plants for natural gas. Catalytic decomposition and reforming of H2S offer viable ways to produce hydrogen from a waste resource, with the added benefit of reducing pollution. However, the conventional thermolysis of hydrogen sulfide, including the traditional Claus process, is highly endothermic and exhibits low conversion at low reaction temperatures. While the photocatalytic pathway would offer a less energy-intensive pathway, its overall efficiency regarding light/heat absorption and utilization needs to be further enhanced. Hydrogen sulfide can be converted via photothermocatalysis into elemental sulfur and hydrogen, two value-added products. This process addresses the drawbacks of pure photo and thermal procedures and could be a viable approach to treating hydrogen sulfide waste streams. This study extensively examines the potential interaction between photo- and thermocatalytic systems, concentrating on the conversion of hydrogen sulfide to hydrogen. The aim is to provide valuable insights and pathways for future optimization. For the first time, as per the literature survey, a photothermocatalytic process that could be extended to both hydrogen sulfide decomposition and reformation toward hydrogen production is proposed, considering current challenges and prospects.

show abstract

“…Nowadays, it is used as a chemical reagent to desulfurize oil or produce ammoniac by Haber–Bosch process. [ 2 ] It is also an emerging fuel for mobility, and it could become a solution to store the excess of energy produced by intermittent and renewable sources of electricity. [ 3 ] Hydrogen is currently predominantly produced by steam reforming of methane, which is a polluting process leading to the emission of greenhouse gases.…”

Section: Introductionmentioning

confidence: 99%

Robust and Bifunctional Electrodeposited NiCoCr Ternary Alloy for Alkaline Water Electrolysis

Tourneur,

Lagrost,

Fabre

2023

Adv Energy and Sustain Res

View full text Add to dashboard Cite

Electrodeposited NiCoCr ternary alloy is explored as a cost‐effective and Earth‐abundant alternative electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline conditions. Different metal salt concentrations (between 10 and 100 mM) and cathodic current densities (between 75 and 225 mA cm−2) are tested to prepare an optimized material exhibiting both the best electrocatalytic efficiency and robustness for water splitting. Combining electrochemistry with complementary physicochemical characterizations (scanning electron microscopy, energy‐dispersive X‐ray spectroscopy analysis, and X‐ray photoelectron spectroscopy) has enabled to gain a deep knowledge of the composition, morphology, and catalytic activity before and after long‐term electrolytic tests. Compared with the related NiCo and NiCr binary alloys, NiCoCr shows catalytic performance for HER similar to NiCr and higher than that of NiCo. In contrast, its catalytic activity for OER is quite comparable to that of NiCo and higher than that of NiCr. Importantly, the presence of Cr is found to be beneficial to increase the oxidation resistance of the ternary alloy. This work provides a scalable way to produce bifunctional and robust electrode materials.

show abstract

Hydrogen Production through Thermal Decomposition of Hydrogen Sulfide: Modification of the Sulfur Recovery Unit To Produce Ultrapure Hydrogen

Cited by 16 publications

References 24 publications

Efficient and Highly Stable 3D-Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

Efficient and Highly Stable 3D-Printed NiFe and NiCo Bifunctional Electrodes for Practical HER and OER

Perspectives in the Synergetic Photothermocatalysis of Hydrogen Sulfide Decomposition for Hydrogen Production: A Comprehensive Review

Robust and Bifunctional Electrodeposited NiCoCr Ternary Alloy for Alkaline Water Electrolysis

Contact Info

Product

Resources

About