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

Monazam, Esmail R.; Siriwardane, Ranjani

doi:10.1021/acs.energyfuels.8b01650

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

Journal Article · Fri Sep 14 00:00:00 EDT 2018 · Energy and Fuels

DOI:https://doi.org/10.1021/acs.energyfuels.8b01650· OSTI ID:1509735

Monazam, Esmail R. ^[1]; ^[2]

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

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.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0004000

OSTI ID:: 1509735

Report Number(s):: NETL-PUB-21879

Journal Information:: Energy and Fuels, Journal Name: Energy and Fuels Journal Issue: 10 Vol. 32; ISSN 0887-0624

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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