Simulation of chlorine-mediated autothermal methane pyrolysis for hydrogen production

Keuchel, Florian; Raveendran, Thisock; Agar, David W.

doi:10.1016/j.ijhydene.2022.10.122

Cited by 3 publications

(2 citation statements)

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“…We have proposed processes that use halogens in pyrolysis to facilitate the homogeneous reaction and to provide the reaction heat in autothermal cycles, as described herein . Recently, Keuchel and colleagues simulated an autothermal methane pyrolysis process using chlorine and found the potential for a cost-competitive process if electrolysis were used for the recovery of chlorine and electricity prices were low. In this paper, we describe experimental results related to a halogen-mediated methane pyrolysis process using chlorine and bromine and address the following questions: What is the temperature dependence of methane conversion in the presence of bromine or chlorine?…”

Section: Introductionmentioning

confidence: 99%

Halogen-Mediated Methane Pyrolysis for CO₂-Free Hydrogen Production

Qi,

McFarland

2024

Energy Fuels

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While low-cost natural gas resources remain abundant, a cost-effective option for the production of hydrogen without direct carbon dioxide emissions is pyrolysis, whereby a hydrocarbon is thermochemically decomposed into hydrogen and solid carbon. A major engineering challenge is providing the large quantities of heat required for the endothermic reaction. We report results for a pyrolysis process in which methane is reacted with sufficient chlorine or bromine such that the partial oxidation reaction to form solid carbon is autothermal, with higher reaction rates and higher equilibrium conversion than with methane alone. The autothermal reaction of 1:1 CH4/Br2 has an equilibrium methane conversion of over 95%, and the results demonstrate over 80% methane conversion in equimolar chlorine or bromine at 950 °C. No catalyst is required; however, in the process, hydrogen and hydrogen halides produced must be separated and the halogen must be regenerated by electrolysis or chemical oxidation. The CO2-free hydrogen cost of production for the halogen-mediated methane pyrolysis process is estimated to be $2.2–$2.4/kg H2, which is lower than that for water electrolysis ($3.5/kg H2) and comparable to conventional methane reforming combined with carbon capture and sequestration ($2.4/kg H2).

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Section: Introductionmentioning

confidence: 99%

Halogen-Mediated Methane Pyrolysis for CO₂-Free Hydrogen Production

Qi,

McFarland

2024

Energy Fuels

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“…Much research has been carried out in the field of plasma methane pyrolysis for the decarbonization of natural gas [10,12,13]. Most of the studies pay attention to the chemical kinetics of plasma pyrolysis [14] or the evaluation of the reaction mechanism and equilibrium composition [12], or the development of different pyrolysis-modified reactors to overcome the limitations of sizeable external energy supply resulting from increasing temperature demand [15][16][17]. To the best of the authors' knowledge, studies on the design of a mobile autothermal plasma methane pyrolysis unit have not been reported.…”

Section: Introductionmentioning

confidence: 99%