BrOx cycle: A novel process for CO2-free energy production from natural gas

Rebordinos, Jesús González; Salten, Alexander H.J.; Agar, David W.

doi:10.1016/j.ijhydene.2016.09.071

Cited by 15 publications

(18 citation statements)

References 5 publications

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“…They argue that the capture and storage of carbon dioxide obtained by methane combustion to prevent its emissions to atmosphere would require up to 40% energy released by methane conversion. They suggested a conversion of methane to coke using bromine, with coke being more easily separated from the gaseous mixture, and not presenting any long term disposal problem compared to carbon dioxide [94]: (27) 4HBr…”

Section: Green Processes and Fuelmentioning

confidence: 99%

“…Figure 9 presents the flowsheet of the bench-scale plant for methane bromination. Besides the production of fuels or chemicals, which is the goal of the gas-to-liquid technologies, a greener energy production from methane using a bromination-oxidation cycle was considered by Rebordinos et al [94]. They argue that the capture and storage of carbon dioxide obtained by methane combustion to prevent its emissions to atmosphere would require up to 40% energy released by methane conversion.…”

Section: Green Processes and Fuelmentioning

confidence: 99%

“…As no carbon dioxide is formed, only about half of the chemical energy, stored in methane, can be liberated that way, which is compensated for by the amount of energy that would be needed for carbon capture and storage (CCS) [94]. The proposed process was studied experimentally in a quartz glass reactor at atmospheric pressure and at temperatures of about 1000 °C, and also theoretically As no carbon dioxide is formed, only about half of the chemical energy, stored in methane, can be liberated that way, which is compensated for by the amount of energy that would be needed for carbon capture and storage (CCS) [94]. The proposed process was studied experimentally in a quartz glass reactor at atmospheric pressure and at temperatures of about 1000 • C, and also theoretically [94].…”

Section: Green Processes and Fuelmentioning

confidence: 99%

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A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

et al. 2020

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Methane is the central component of natural gas, which is globally one of the most abundant feedstocks. Due to its strong C–H bond, methane activation is difficult, and its conversion into value-added chemicals and fuels has therefore been the pot of gold in the industry and academia for many years. Industrially, halogenation of methane is one of the most promising methane conversion routes, which is why this paper presents a comprehensive review of the literature on methane activation by halogenation. Homogeneous gas phase reactions and their pertinent reaction mechanisms and kinetics are presented as well as microkinetic models for methane reaction with chlorine, bromine, and iodine. The catalysts for non-oxidative and oxidative catalytic halogenation were reviewed for their activity and selectivity as well as their catalytic action. The highly reactive products of methane halogenation reactions are often converted to other chemicals in the same process, and these multi-step processes were reviewed in a separate section. Recent advances in the available computational power have made the use of the ab initio calculations (such as density functional theory) routine, allowing for in silico calculations of energy profiles, which include all stable intermediates and the transition states linking them. The available literature on this subject is presented. Lastly, green processes and the production of fuels as well as some unconventional methods for methane activation using ultrasound, plasma, superacids, and light are also reviewed.

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Section: Green Processes and Fuelmentioning

confidence: 99%

Section: Green Processes and Fuelmentioning

confidence: 99%

Section: Green Processes and Fuelmentioning

confidence: 99%

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A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

et al. 2020

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

true \begin{matrix} center {normalH}_{2} normalS + normalB {normalr}_{2} ⇌ \frac{1}{8} {normalS}_{8 (s)} + 2 normalHBr & center normalΔ H_{normalR, 298} = - 57.2 normal normalkJ normal normalmo {normall}^{- 1} \end{matrix}

true \begin{matrix} center 2 normalHBr + 0.5 {normalO}_{2} ⇌ normalB {normalr}_{2} + {normalH}_{2} normalO & center normalΔ H_{normalR, 298} = - 182.0 normal normalkJ normal normalmo {normall}^{- 1} \end{matrix}

true \begin{matrix} center {normalH}_{2} normalS + 0.5 {normalO}_{2} ⇌ \frac{1}{8} {normalS}_{8 (s)} + {normalH}_{2} normalO & center normalΔ H_{normalR, 298} = - 239.2 normal normalkJ normal normalmo {normall}^{- 1} \end{matrix}

…”

Section: Introductionmentioning

confidence: 99%

“…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

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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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CFD Modeling of Reactor Concepts to Avoid Carbon Deposition in Pyrolysis Reactions

Becker

Keuchel

Agar

2021

Chemie Ingenieur Technik

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Methane pyrolysis in an externally heated tubular reactor inevitably ends with clogging of the reactor. Thin molten metal wall films protect the walls from carbon depositions. A falling film reactor and a rotating film reactor are investigated by CFD simulation. The results show the considerable advantages of a rotating film reactor compared to the vertical film reactor. An alternative route for carbon production from methane is the implementation of an exothermic chlorination reaction. The tubular reactor concept involves the inflow of inert gas at the reactant inlet and through porous walls to ensure that the reaction takes place in the center, thus, largely reducing carbon deposits.

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BrOx cycle: A novel process for CO2-free energy production from natural gas

Cited by 15 publications

References 5 publications

A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

A Review of Methane Activation Reactions by Halogenation: Catalysis, Mechanism, Kinetics, Modeling, and Reactors

Selective Partial Oxidation of Hydrogen Sulfide by the BrOx Cycle

CFD Modeling of Reactor Concepts to Avoid Carbon Deposition in Pyrolysis Reactions

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