Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis

doi:10.1021/acs.energyfuels.8b01650

Title: Hydrogen Production by Steam Oxidation of Reduced CaFe₂O₄ during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis

Abstract

CaFe₂O₄ reduced during chemical looping coal gasification can be oxidized with steam for production of hydrogen. The conversion and equilibrium data of the oxidation of reduced CaFe₂O₄ with steam were analyzed using steam concentrations of 10–25 vol % with a balance of helium and the temperature range of 1023–1123 K. Experimental data were evaluated to characterize H₂ production rates and oxidation isotherms. The film diffusion was the controlling step for the oxygen uptake process, and its parameters were determined on the basis of the uptake rate model. The steady-state oxygen uptake data were also evaluated with Langmuir, Temkin, Freundlich, and Dubinin–Radushkevich isotherms. The Langmuir isotherm model correlated the oxidation isotherms best, and the peak uptake capacity decreased with increasing temperatures, which suggests an exothermic process. In conclusion, the negative Gibbs free energy values (–ΔG°) implied the spontaneous nature of the uptake process at 1023–1123 K.

Authors:

Monazam, Esmail R. ^[1];

^[2]

REM Engineering Services, PLLC, Morgantown, WV (United States)
National Energy Technology Lab. (NETL), Morgantown, WV (United States)

Publication Date:: 2018-09-14

Research Org.:: National Energy Technology Lab. (NETL), Morgantown, WV (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE)

OSTI Identifier:: 1509735

Report Number(s):: NETL-PUB-21879
Journal ID: ISSN 0887-0624

Grant/Contract Number:: FE0004000

Resource Type:: Accepted Manuscript

Journal Name:: Energy and Fuels

Additional Journal Information:: Journal Volume: 32; Journal Issue: 10; Journal ID: ISSN 0887-0624

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 08 HYDROGEN; 42 ENGINEERING; 01 COAL, LIGNITE, AND PEAT

Citation Formats


                    Monazam, Esmail R., and Siriwardane, Ranjani. Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis.  United States: N. p., 2018. 
        Web.  doi:10.1021/acs.energyfuels.8b01650.

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                    Monazam, Esmail R., & Siriwardane, Ranjani. Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis.  United States.  doi:https://doi.org/10.1021/acs.energyfuels.8b01650

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                    Monazam, Esmail R., and Siriwardane, Ranjani. Fri .  
        "Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis".  United States.  doi:https://doi.org/10.1021/acs.energyfuels.8b01650.  https://www.osti.gov/servlets/purl/1509735.

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@article{osti_1509735,

  title        = {Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis},

  author       = {Monazam, Esmail R. and Siriwardane, Ranjani},

  abstractNote = {CaFe2O4 reduced during chemical looping coal gasification can be oxidized with steam for production of hydrogen. The conversion and equilibrium data of the oxidation of reduced CaFe2O4 with steam were analyzed using steam concentrations of 10–25 vol % with a balance of helium and the temperature range of 1023–1123 K. Experimental data were evaluated to characterize H2 production rates and oxidation isotherms. The film diffusion was the controlling step for the oxygen uptake process, and its parameters were determined on the basis of the uptake rate model. The steady-state oxygen uptake data were also evaluated with Langmuir, Temkin, Freundlich, and Dubinin–Radushkevich isotherms. The Langmuir isotherm model correlated the oxidation isotherms best, and the peak uptake capacity decreased with increasing temperatures, which suggests an exothermic process. In conclusion, the negative Gibbs free energy values (–ΔG°) implied the spontaneous nature of the uptake process at 1023–1123 K.},

  doi          = {10.1021/acs.energyfuels.8b01650},

  journal      = {Energy and Fuels},

  number       = 10,

  volume       = 32,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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DOI: https://doi.org/10.1021/acs.energyfuels.8b01650

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Title: Hydrogen Production by Steam Oxidation of Reduced CaFe2O4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis

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