A numerical investigation of methane pyrolysis in a molten catalyst Bath–A single bubble approach

Mehrabian, Nazgol; Seyfaee, Ahmad; Nathan, Graham J.; Jafarian, Mehdi

doi:10.1016/j.ijhydene.2023.02.047

Cited by 6 publications

(5 citation statements)

References 52 publications

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“…Reactor effluent from the MP process contains hydrogen, unreacted natural gas, and solid carbon. 57 Consequently, the incorporation of a solid−gas separation unit is essential. Various technologies, such as cyclones, baghouse filters, or electrostatic precipitators, are viable options for achieving this separation.…”

Section: Solid−gas Separation and Product Purificationmentioning

confidence: 99%

“…Reactor effluent from the MP process contains hydrogen, unreacted natural gas, and solid carbon . Consequently, the incorporation of a solid–gas separation unit is essential.…”

Section: Hydrogen From Methane Pyrolysismentioning

confidence: 99%

“…MP is an alternate method for producing hydrogen from natural gas or CH 4 through a catalytic or non-catalytic reaction at 500–1600 °C without emitting carbon dioxide. , Methane (CH 4 ) undergoes a splitting process into its elementary components: solid carbon and hydrogen gas. Numerous researchers have investigated this process, recognizing it as a promising avenue for the clean H 2 production. , …”

Section: Hydrogen From Methane Pyrolysismentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive Review on Methane Pyrolysis for Sustainable Hydrogen Production

Pangestu,

Malaibari,

Muhammad

et al. 2024

Energy Fuels

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The reliance on natural gas as a fossil fuel often overshadows its potential for clean energy transformation. In contrast with the steam methane reforming (SMR) process, renowned for its substantial CO 2 emissions, methane pyrolysis (MP) stands out for its capability to produce hydrogen without any accompanying CO 2 byproducts. Additionally, MP presents the added advantage of generating valuable solid carbon co-products. The primary focus of this review is the commercialization or large-scale application of the MP process. This necessitates a detailed investigation into process design refinement, the selection between catalytic or non-catalytic processes, and the emergence of mature reactor types suitable for commercial scalability. This review further explores the various kinds of solid carbon (carbon black, carbon nanotubes, carbon nanofibers, and graphite) produced during MP, analyzing the process conditions for targeted synthesis and their potential market applications. Techno-economic considerations of different MP processes are evaluated, along with potential integration strategies with renewable energy sources (solar-driven reactors) and existing technologies (SMR and gasification) to accelerate progress toward net-zero emissions. This review underscores the exciting potential of MP for a cleaner hydrogen future while creating economic value from carbon co-products.

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Section: Solid−gas Separation and Product Purificationmentioning

confidence: 99%

“…Reactor effluent from the MP process contains hydrogen, unreacted natural gas, and solid carbon . Consequently, the incorporation of a solid–gas separation unit is essential.…”

Section: Hydrogen From Methane Pyrolysismentioning

confidence: 99%

Section: Hydrogen From Methane Pyrolysismentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive Review on Methane Pyrolysis for Sustainable Hydrogen Production

Pangestu,

Malaibari,

Muhammad

et al. 2024

Energy Fuels

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“…Hence, if it can be produced either from renewable resources or from fossil fuels with CO 2 capture, it can be a carbon neutral fuel. There are primarily four methods used to produce hydrogen at industrial scales, including methane reforming (SMR), coal gasification (CG), oil reforming and water electrolysis [1,2]. The dominant SMR process produces H 2 at the cost of ~1.5 USD/kgH 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In a methane pyrolysis molten catalyst bubbling (MCB) reactor, methane is dispersed from submerged nozzles into a molten bath, where it dissociates mostly to H 2 and carbon (Equation ( 1)) as the bubbles rise through the bath. The buoyancy force induced by the substantial difference between the density of the carbon and that of the molten bath floats the carbon product to the surface of the molten bath, from where it can be removed [1]. The methane pyrolysis MCB reactors appearing in the literature operate predominantly under a semi-batch configuration with a noncontinuous removal of the carbon product.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Evaluation of Methods for Continuous Carbon Removal from a Molten Catalyst Bubbling Methane Pyrolysis Reactor

Cooper-Baldock,

Perrelle,

Phelps

et al. 2024

Energies

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Methane pyrolysis in molten catalyst bubble (MCB) column reactors is an emerging technology that enables the simultaneous production of hydrogen and solid carbon, together with a mechanism for separating the two coproducts. In this process, methane is dispersed as bubbles into a high temperature molten catalyst bath producing hydrogen and low-density carbon, which floats to the surface of the bath from providing a means for them to be separated. However, the removal of carbon particulates from a bubbling column reactor is technically challenging due to the corrosive nature of the molten catalysts, contamination of the product carbon with the molten catalysts, high temperatures and lack of understanding of the technology options. Four potential concepts for the removal of carbon particulate from a methane pyrolysis molten metal bubble column reactor are presented, based on the pneumatic removal of the particles or their overflow from the reactor. The concepts are evaluated using a cold prototype reactor model. To simulate the operation of a high-temperature reactor at low temperatures, the dominant dimensionless numbers are identified and matched between a reference high-temperature reactor and the developed cold prototype using water, air and hollow glass microsphere particles as the representatives of the molten catalyst, gaseous phases and solid carbon particulates, respectively. The concepts are tested in the cold prototype. High rates of particle removal are achieved, but with different tradeoffs. The applicability of each method together with their advantages and disadvantages are discussed.

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