Flowsheeting and optimisation of the BrOx cycle for CO2-free energy production from natural gas

Rebordinos, Jesús González; Kampwerth, Jan; Agar, David W.

doi:10.1016/j.energy.2017.05.085

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…Complete oxygen conversion was observed during the O 2 part of the cycle, in which 1.5 sccm O 2 was bubbled through LiI:LiOH for 1 h. Initially, molten LiI–LiOH was visually clear, but the melt became dark red after oxygen was introduced. We hypothesize that the red color is coming from dissolved iodine, which has been reported to result in I 4 . − A separate experiment in which a pure oxygen bubble was held under the surface resulted in the bubble immediately becoming purple (the color of iodine gas) and then shrinking in size until it was too small to see. This is likely from a fast surface reaction of oxygen and LiI to form iodine gas, followed by the dissolution of iodine into the melt.…”

Section: Resultsmentioning

confidence: 97%

“…Complete methane conversion is possible, for example, in a longer bubble column where iodine and methane can react further. On the basis of the material balance, some of this iodine left the reactor in the effluent stream and some of it dissolved in the melt, possibly as I 4 . − The role of this dissolved iodine and other reactor configurations are discussed later.…”

Section: Resultsmentioning

confidence: 99%

“…The challenge of avoiding carbon oxide formation has been recently addressed with separate methane and oxygen feeds in a multistep chemical looping process for partial combustion. , Bromine is used to activate methane and produce carbon and hydrogen bromide (reaction , when X = Br). Carbon is then separated in another vessel.…”

Section: Introductionmentioning

confidence: 99%

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Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon

Upham

Snodgrass

Palmer

et al. 2018

ACS Sustainable Chem. Eng.

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The partial oxidation of methane to carbon and steam was investigated in molten salts for a process to produce CO 2 -free electrical power and solid carbon. Lithium iodide and lithium bromide catalysts were used in a bubble column where insoluble carbon accumulates on the melt surface and could be continuously removed. The salt acts as a heat transfer medium and reacts with oxygen to produce halogens and consume hydrogen halides in a chemical looping cycle. The halogens react with methane in gas-phase bubbles and form hydrogen halides and carbon. Hydrogen halides are then neutralized by an oxide and form steam and a halide salt. The halide salt reacts with oxygen, forming an oxide and closing both the halogen and the salt chemical looping cycles in a single vessel. Selectivities to carbon of 90% were measured for 56% methane conversion in a 12 cm bubble column reactor. The carbon was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, and Raman spectroscopy. Iodide and bromide salts were investigated along with the behavior of iodine, bromine, methyl iodide, and methyl bromide intermediates.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon

Upham

Snodgrass

Palmer

et al. 2018

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

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“…[ 90 ] The water either remains in a liquid state or an extremely dense supercritical state under these circumstances. [ 91 ] This method makes use of the unique qualities of compressed hot water. The biomass goes through a series of depolymerization events during the liquefaction process, including hydrolysis, dehydration, and decarboxylation, producing insoluble compounds like bio‐crude oil or bio‐carbon.…”

Section: Hydrogen Production Technologiesmentioning

confidence: 99%

Recent Advances and Challenges of Hydrogen Production Technologies via Renewable Energy Sources

Worku,

Ayele,

Deepak

et al. 2024

Adv Energy and Sustain Res

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Currently, fossil fuels play a major role in meeting the world's energy demand. Fossil fuels, in contrast, threaten the planet's ecosystems and biological processes, contribute to global warming, and result in unfavorable climatic shifts. These energy sources are also finite and will eventually deplete. Thus, energy transition, which is the key from fossil fuels to renewable energy sources, is regarded as an essential course of action for decarbonizing the global economy and reducing the catastrophic and irreversible effects of climate change. Thereby using/consuming green hydrogen energy is a vital solution to meet the world's challenges. Subsequently, the pros and cons of several hydrogen generation methods, such as the conversion of fossil fuels, biomass, water electrolysis, microbial fermentation, and photocatalysis, are then compared and outlined in terms of their technologies, economies, consumption of energy, environmental aspects, and costs. Currently, the chemical industry uses green hydrogen (H2) primarily to produce green emerging fuels methanol and ammonia (NH3), which are regarded as alternate sources of energy. Finally, the current state of energy demands, recent developments in renewable energy sources, and the potential of hydrogen as a future fuel are outlined. Moreover, the discussion concludes with predicted opportunities and challenges.

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“…Combined, both reactions result in the bromination oxidation (BrOx) cycle (see Fig. 2), which was also investigated for CO 2 -free energy generation from methane [9,10].…”

Section: Introductionmentioning

confidence: 99%

Selective Partial Oxidation of Hydrogen Sulfide by the BrOx Cycle

Wiesehahn

Buzilowski

Kembügler

et al. 2019

Chemie Ingenieur Technik

Self Cite

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Neutralization of the toxic gas hydrogen sulfide is an important step in almost every natural gas processing plant. A novel method for the conversion of hydrogen sulfide is a combination of bromination and oxidation reactions (BrOx). The first of those, the bromination of hydrogen sulfide, is investigated experimentally. An analysis of the potential by‐products reveals that their formation during the reaction can be excluded. Furthermore, a parameter study showed that reaction yields of up to 94 % are achievable by suitable reaction conditions.

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Flowsheeting and optimisation of the BrOx cycle for CO2-free energy production from natural gas

Cited by 6 publications

References 11 publications

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon

Recent Advances and Challenges of Hydrogen Production Technologies via Renewable Energy Sources

Selective Partial Oxidation of Hydrogen Sulfide by the BrOx Cycle

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Flowsheeting and optimisation of the BrOx cycle for CO2-free energy production from natural gas

Cited by 6 publications

References 11 publications

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO2-Free Power and Solid Carbon

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO2-Free Power and Solid Carbon

Recent Advances and Challenges of Hydrogen Production Technologies via Renewable Energy Sources

Selective Partial Oxidation of Hydrogen Sulfide by the BrOx Cycle

Contact Info

Product

Resources

About

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon

Halogen-Mediated Partial Combustion of Methane in Molten Salts To Produce CO₂-Free Power and Solid Carbon