Catalytic methane pyrolysis in molten MnCl2-KCl

Dohyung Kang; Nazanin Rahimi; Michael J. Gordon; Horia Metiu; Eric W. McFarland

doi:10.1016/j.apcatb.2019.05.026

Catalytic methane pyrolysis in molten MnCl₂-KCl

Dohyung Kang, Nazanin Rahimi, Michael J. Gordon, Horia Metiu, Eric W. McFarland

Dept. of Future Energy Convergence

University of California at Santa Barbara

Research output: Contribution to journal › Article › peer-review

151 Scopus citations

Abstract

Methane decomposition to produce molecular hydrogen and solid carbon was catalyzed by contact with molten KCl:MnCl₂ mixtures in a bubble column reactor from 700 to 1050 °C. The apparent activation energy decreased from approximately 300 kJ/mole for pure KCl to 161 kJ/mole in a 67:33 mol % mixture of KCl:MnCl₂. At 30% methane conversion, pyrolysis in the KCl:MnCl₂ melt at 1050 °C had high hydrogen selectivity (˜99%) in comparison to pure molten KCl (˜90%), which was observed to produce multiple hydrocarbon co-products. The pyrolysis activity of the KCl:MnCl₂ melt remained stable for over 30 h and produced a separable, highly graphitic carbon solid that accumulated at the surface of the higher-density salt melt.

Original language	English
Pages (from-to)	659-666
Number of pages	8
Journal	Applied Catalysis B: Environmental
Volume	254
DOIs	https://doi.org/10.1016/j.apcatb.2019.05.026
State	Published - 5 Oct 2019

Keywords

Graphitic carbon
Hydrogen
Manganese chloride
Methane decomposition
Molten salt

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10.1016/j.apcatb.2019.05.026

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title = "Catalytic methane pyrolysis in molten MnCl2-KCl",

abstract = "Methane decomposition to produce molecular hydrogen and solid carbon was catalyzed by contact with molten KCl:MnCl2 mixtures in a bubble column reactor from 700 to 1050 °C. The apparent activation energy decreased from approximately 300 kJ/mole for pure KCl to 161 kJ/mole in a 67:33 mol \% mixture of KCl:MnCl2. At 30\% methane conversion, pyrolysis in the KCl:MnCl2 melt at 1050 °C had high hydrogen selectivity (˜99\%) in comparison to pure molten KCl (˜90\%), which was observed to produce multiple hydrocarbon co-products. The pyrolysis activity of the KCl:MnCl2 melt remained stable for over 30 h and produced a separable, highly graphitic carbon solid that accumulated at the surface of the higher-density salt melt.",

keywords = "Graphitic carbon, Hydrogen, Manganese chloride, Methane decomposition, Molten salt",

author = "Dohyung Kang and Nazanin Rahimi and Gordon, \{Michael J.\} and Horia Metiu and McFarland, \{Eric W.\}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = oct,

day = "5",

doi = "10.1016/j.apcatb.2019.05.026",

language = "English",

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TY - JOUR

T1 - Catalytic methane pyrolysis in molten MnCl2-KCl

AU - Kang, Dohyung

AU - Rahimi, Nazanin

AU - Gordon, Michael J.

AU - Metiu, Horia

AU - McFarland, Eric W.

PY - 2019/10/5

Y1 - 2019/10/5

N2 - Methane decomposition to produce molecular hydrogen and solid carbon was catalyzed by contact with molten KCl:MnCl2 mixtures in a bubble column reactor from 700 to 1050 °C. The apparent activation energy decreased from approximately 300 kJ/mole for pure KCl to 161 kJ/mole in a 67:33 mol % mixture of KCl:MnCl2. At 30% methane conversion, pyrolysis in the KCl:MnCl2 melt at 1050 °C had high hydrogen selectivity (˜99%) in comparison to pure molten KCl (˜90%), which was observed to produce multiple hydrocarbon co-products. The pyrolysis activity of the KCl:MnCl2 melt remained stable for over 30 h and produced a separable, highly graphitic carbon solid that accumulated at the surface of the higher-density salt melt.

AB - Methane decomposition to produce molecular hydrogen and solid carbon was catalyzed by contact with molten KCl:MnCl2 mixtures in a bubble column reactor from 700 to 1050 °C. The apparent activation energy decreased from approximately 300 kJ/mole for pure KCl to 161 kJ/mole in a 67:33 mol % mixture of KCl:MnCl2. At 30% methane conversion, pyrolysis in the KCl:MnCl2 melt at 1050 °C had high hydrogen selectivity (˜99%) in comparison to pure molten KCl (˜90%), which was observed to produce multiple hydrocarbon co-products. The pyrolysis activity of the KCl:MnCl2 melt remained stable for over 30 h and produced a separable, highly graphitic carbon solid that accumulated at the surface of the higher-density salt melt.

KW - Graphitic carbon

KW - Hydrogen

KW - Manganese chloride

KW - Methane decomposition

KW - Molten salt

UR - https://www.scopus.com/pages/publications/85066138026

U2 - 10.1016/j.apcatb.2019.05.026

DO - 10.1016/j.apcatb.2019.05.026

M3 - Article

AN - SCOPUS:85066138026

SN - 0926-3373

VL - 254

SP - 659

EP - 666

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

ER -

Catalytic methane pyrolysis in molten MnCl₂-KCl

Abstract

Keywords

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