Solid carbon production and recovery from high temperature methane pyrolysis in bubble columns containing molten metals and molten salts
By N. Rahimi, Dohyung Kang, John Gelinas, A. Menon, M. Gordon, Horia Metiu, Eric W. McFarland. Carbon, 2019
148 citations recorded by the source corpus.
Abstract We study methane pyrolysis in a bubble column reactor consisting of a layer of molten NiBi alloy, and a molten salt layer floating on the metal layer. The molten metal is a pyrolysis catalyst; the molten salt layer is added for removing contaminants from the carbon product. Methane is introduced at the bottom of the reactor and the rising bubbles contain reactant and product gases together with metal vapor and flakes of solid carbon. When the bubbles rise through the molten salt layer the metal vapor condenses producing dense liquid metal droplets, which sink to the metal phase; the low-density carbon rises to the top of the salt layer. The carbon generated from the single-phase molten NiBi reactor has a different structure from that produced in the two-phase NiBi/salt reactor. The amount of metal in the carbon product is less than 5 wt %, in the two-phase reactor, compared to 83 wt % in the NiBi single-phase reactor. After subsequent purification steps one obtains solid carbon with less than 2.0 wt % salt contamination and no detectable metal contamination.
Subfields: Biomedical Engineering, Catalysis, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/af1d84b571738c4eaf9214eabe55677dbd266a1f
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Citations in the corpus
- Methane pyrolysis in a molten gallium bubble column reactor for sustainable hydrogen production: Proof of concept & techno-economic assessment (2020, background): “Recently, several authors, Rahimi et al. [30] re-ported that the addition of molten bromide salts in a reactor containing a liquid catalyst with 27% Ni e 73% Bi reduced the metal impurities of the produced carbon to less than 0.1 wt%.”
- Methane Cracking for Hydrogen Production: A Review of Catalytic and Molten Media Pyrolysis (2021, background): “In the case of close densities, the metal disperses in the salt, and then bubbles completely detach from the salt interface [121].”