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Title: Hydrogen Production by Steam Oxidation of Reduced CaFe 2O 4 during Chemical Looping Coal Gasification: Equilibrium and Kinetic Analysis

Abstract

CaFe 2O 4 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 CaFe 2O 4 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 H 2 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 (–Δ G°) implied the spontaneous nature of the uptake process at 1023–1123 K.

Authors:
 [1]; ORCiD logo [2]
  1. REM Engineering Services, PLLC, Morgantown, WV (United States)
  2. National Energy Technology Lab. (NETL), Morgantown, WV (United States)
Publication Date:
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

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.
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:10.1021/acs.energyfuels.8b01650.
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:10.1021/acs.energyfuels.8b01650. https://www.osti.gov/servlets/purl/1509735.
@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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