Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Reduction kinetics of hercynite redox materials for solar thermochemical water splitting

Journal Article · · Chemical Engineering Journal
 [1];  [2];  [3]
  1. Univ. of Colorado, Boulder, CO (United States); King Abdullah University of Science and Technology (KAUST), Thuwal (Saudi Arabia); OSTI
  2. CSIRO Energy, Newcastle, NSW (Australia)
  3. Univ. of Colorado, Boulder, CO (United States)

Solar thermochemical water splitting (STWS) using a hercynite redox cycle is a promising technology for producing renewable H2. Here, the reduction kinetics of hercynite (FeAl2O4) is evaluated using thermogravimetric and XRD analyses. The results indicate that as-prepared hercynite materials undergo reduction via two different reaction mechanisms. The reaction first proceeds by a nucleation and growth mechanism (AE1), followed by a third-order kinetic model (F3). XRD analyses show the occurrence of superstoichiometric oxygen in the spinel structure of FeAl2O4+δ in the second reaction mechanism, which indicates the formation of cationic vacancies. TGA and XRD analyses confirm that hercynite maintains its spinel structure when the materials are thermally reduced and oxidized with steam. Differential scanning calorimetry (DSC) performed on FeAl2O4 particles shows two heats of reaction in agreement with the two observed mechanisms. This is the first kinetics study to report on the thermal reduction of hercynite.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0006671
OSTI ID:
1799226
Alternate ID(s):
OSTI ID: 1601303
Journal Information:
Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Vol. 389; ISSN 1385-8947
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (50)

Kinetics of the thermal dissociation of ZnO exposed to concentrated solar irradiation using a solar-driven thermogravimeter in the 1800-2100 K range journal June 2009
Hydrogen production via solar-aided water splitting thermochemical cycles with nickel ferrite: Experiments and modeling journal August 2012
Hydrogen-assisted Carbon Dioxide Thermochemical Reduction on La 0.9 Ca 0.1 FeO 3− δ Membranes: A Kinetics Study journal January 2018
Basics and Applications of Solid-State Kinetics: A Pharmaceutical Perspective**The authors dedicate this review to the memory of Dr. David J.W. Grant who passed away on December 9, 2005. Dr. Grant was an internationally known authority at the University of Minnesota on the solid-state properties of drugs. He will be remembered as a kind, humble, and brilliant scholar. journal March 2006
Distribution of Cations in Mixed Zn–Mn–Al–O Containing Spinels, Model Catalysts for the Reduction of Nitrobenzene to Nitrosobenzene journal May 1996
Formation of Nickel, Cobalt, Copper, and Iron Aluminates fromα- andγ-Alumina-Supported Oxides: A Comparative Study journal January 1998
Solar Thermal Hydrogen Production from Water over Modified CeO2 Materials journal June 2013
Composition and cation-vacancy distribution of cation-deficient spinel oxides journal August 1991
Hydrogen production from water utilizing solar heat at high temperatures journal January 1977
The use of the JMAYK kinetic equation for the analysis of solid-state reactions: critical considerations and recent interpretations journal November 1995
Point defects and cation tracer diffusion in (CrxFe1 − x)3 − δO4 spinels journal November 1995
Correlation between oxidation states of transition metal ions and variation of the coercivity in mixed-valence defect spinel ferrites journal November 1997
Solar hydrogen production via a two-step water-splitting thermochemical cycle based on Zn/ZnO redox reactions journal June 2002
Continuous on-sun solar thermochemical hydrogen production via an isothermal redox cycle journal September 2019
Reduction and oxidation kinetics of Co–Ni/Al2O3 oxygen carrier involved in a chemical-looping combustion cycles journal January 2010
Exploiting kinetics to unravel the role of a ZnO diluent in the production of CO via oxidizing Zn particles with CO 2 journal June 2017
Friedman method kinetic analysis of CaO-based sorbent for high-temperature thermochemical energy storage journal June 2019
Reduction kinetics for large spherical 2:1 iron–manganese oxide redox materials for thermochemical energy storage journal June 2019
Nonstoichiometric Perovskite Oxides for Solar Thermochemical H2 and CO Production journal January 2014
Reactive ceramics of CeO2–MOx (M=Mn, Fe, Ni, Cu) for H2 generation by two-step water splitting using concentrated solar thermal energy journal May 2007
A spinel ferrite/hercynite water-splitting redox cycle journal April 2010
Atomic layer deposited thin film metal oxides for fuel production in a solar cavity reactor journal November 2012
Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production journal December 2012
Improved kinetic model for water splitting thermochemical cycles using Nickel Ferrite journal April 2014
Hydrogen production by two-step thermochemical cycles based on commercial nickel ferrite: Kinetic and structural study journal April 2014
Investigation of Zr, Gd/Zr, and Pr/Zr – doped ceria for the redox splitting of water journal January 2020
Synthesis and characterization of mixed manganese-gallium oxides Mn3-xGaxO4 (x = 1–2) with the spinel structure journal November 2017
Kinetic analysis on carbothermic reduction of GeO2 for germanium recovery from waste scraps journal January 2019
Kinetic Analysis of Rice Husk Pyrolysis Using Kissinger-Akahira-Sunose (KAS) Method journal January 2016
Kinetics and mechanism of solar-thermochemical H2 and CO production by oxidation of reduced CeO2 journal January 2018
Particle design and oxidation kinetics of iron-manganese oxide redox materials for thermochemical energy storage journal May 2019
Kinetic study of forest fuels by TGA: Model-free kinetic approach for the prediction of phenomena journal January 2010
ICTAC Kinetics Committee recommendations for performing kinetic computations on thermal analysis data journal June 2011
Kinetics of CO 2 Reduction over Nonstoichiometric Ceria journal July 2015
Understanding Redox Kinetics of Iron-Doped Manganese Oxides for High Temperature Thermochemical Energy Storage journal December 2016
Solid-State Kinetic Models:  Basics and Mathematical Fundamentals journal September 2006
Diffusion of Oxygen in Ceria at Elevated Temperatures and Its Application to H 2 O/CO 2 Splitting Thermochemical Redox Cycles journal February 2014
Thermodynamic and kinetic assessments of strontium-doped lanthanum manganite perovskites for two-step thermochemical water splitting journal January 2014
Predicting the solar thermochemical water splitting ability and reaction mechanism of metal oxides: a case study of the hercynite family of water splitting cycles journal January 2015
Nonstoichiometric oxygen in Mn–Ga–O spinels: reduction features of the oxides and their catalytic activity journal January 2018
BaCe 0.25 Mn 0.75 O 3−δ —a promising perovskite-type oxide for solar thermochemical hydrogen production journal January 2018
Reactivity towards oxygen and cation distribution of manganese iron spinel Mn3−xFexO4 (0≤x≤3) fine powders studied by thermogravimetry and IR spectroscopy journal January 1997
Electrochemical Li-ion storage in defect spinel iron oxides: the critical role of cation vacancies journal January 2011
Kinetics and mechanism of solar-thermochemical H2 production by oxidation of a cobalt ferrite–zirconia composite journal January 2013
On the cation vacancy distribution in MgAl 2 O 4 spinels journal July 1991
Phase Equilibria in the System Fe-Al-O journal November 1980
Cation Disorder and Vacancy Distribution in Nonstoichiometric Magnesium Aluminate Spinel, MgO·xAl2O3 journal December 1999
Efficient Generation of H2 by Splitting Water with an Isothermal Redox Cycle journal August 2013
Ethanol Reactions over the Surfaces of Noble Metal/Cerium Oxide Catalysts journal July 2004
Kinetics of Solid-Gas Reactions and Their Application to Carbonate Looping Systems journal August 2019

Similar Records

Interaction of Iron with Alumina Refractory Under Flash Ironmaking Conditions
Journal Article · Thu Aug 15 00:00:00 EDT 2019 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science · OSTI ID:22933527

Oxidation Kinetics of Hercynite Spinels for Solar Thermochemical Fuel Production
Journal Article · Wed Jun 24 00:00:00 EDT 2020 · Chemical Engineering Journal · OSTI ID:1660100

Thermal and x-ray diffraction analyses of reactions of B/CaCrO sub 4 and Ti/KClO sub 4 pyrotechnic blends
Conference · Mon Dec 31 23:00:00 EST 1990 · OSTI ID:5068378