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Abstract
Metal oxide materials are known for their ability to store thermochemical energy through reversible redox reactions. Metal oxides provide a new category of materials with exceptional performance in terms of thermochemical energy storage, reaction stability and oxygen-exchange and uptake capabilities. However, these characteristics are predicated on the right combination of the metal oxide candidates. In this study, metal oxide materials consisting of pure oxides, like cobalt(II) oxide, manganese(II) oxide, and iron(II, III) oxide (Fe3O4), and mixed oxides, such as (100 wt.% CoO, 100 wt.% Fe3O4, 100 wt.% CoO, 25 wt.% MnO + 75 wt.% CoO, 75 wt.% MnO + 25 wt.% CoO) and 50 wt.% MnO + 50.wt.% CoO), which was subjected to a two-cycle redox reaction, was proposed. The various mixtures of metal oxide catalysts proposed were investigated through the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), energy dispersive X-ray (EDS), and scanning electron microscopy (SEM) analyses. The effect of argon (Ar) and oxygen (O2) at different gas flow rates (20, 30, and 50 mL/min) and temperature at thermal charging step and thermal discharging step (30–1400 °C) during the redox reaction were investigated. It was revealed that on the overall, 50 wt.% MnO + 50 wt.% CoO oxide had the most stable thermal stability and oxygen exchange to uptake ratio (0.83 and 0.99 at first and second redox reaction cycles, respectively). In addition, 30 mL/min Ar–20 mL/min O2 gas flow rate further increased the proposed (Fe,Co,Mn)Ox mixed oxide catalyst’s cyclic stability and oxygen uptake ratio. SEM revealed that the proposed (Fe,Co,Mn)Ox material had a smooth surface and consisted of polygonal-shaped structures. Thus, the proposed metallic oxide material can effectively be utilized for high-density thermochemical energy storage purposes. This study is of relevance to the power engineering industry and academia.
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Bulfin B, Vieten J, Richter S, Naik JM, Patzke GR, Roeb M, Sattler C, Steinfeld A. Isothermal relaxation kinetics for the reduction and oxidation of SrFeO 3 based perovskites. Phys Chem Chem Phys 2020; 22:2466-2474. [PMID: 31939962 DOI: 10.1039/c9cp05771d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The perovskite oxide SrFeO3 has favourable redox properties for oxygen exchange applications, including oxygen separation and oxygen production chemical looping cycles. For such applications, lower temperature operation can improve the energy demand and feasibility of the process, but can also lead to kinetic limitations. Here we investigate the oxidation and reduction reaction kinetics of SrFeO3 in the temperature range 450-750 K. Isothermal relaxation techniques are used to observe the reaction rates across this temperature range, using a thermogravimetric analysis system. Experimental data are analysed according to an isoconversional method and fit with a simple power law model to extract activation energies. The apparent activation energy of oxidation and reduction was found to be 92 ± 16 and 144 ± 17 kJ mol-1 respectively. Comparison of oxidation and reduction kinetics together with considerations of particle size indicate that the oxidation reaction rate may be limited by diffusion in the bulk, while the reduction reaction rate is limited by the surface reaction. Furthermore, we also investigated the mixed perovskite Sr0.93Ca0.07Fe0.9Co0.1O3, which exhibited a 4-fold increase in the oxidation rate.
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Affiliation(s)
- B Bulfin
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
| | - J Vieten
- Institute of Solar Research, German Aerospace Center, 51147 Cologne, Germany and Faculty of Mechanical Science and Engineering, Institute of Power Engineering, Professorship of Solar Fuel production, TU Dresden, 01062 Dresden, Germany
| | - S Richter
- Institute of Solar Research, German Aerospace Center, 51147 Cologne, Germany and Faculty of Mechanical Science and Engineering, Institute of Power Engineering, Professorship of Solar Fuel production, TU Dresden, 01062 Dresden, Germany
| | - J M Naik
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - G R Patzke
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
| | - M Roeb
- Institute of Solar Research, German Aerospace Center, 51147 Cologne, Germany
| | - C Sattler
- Institute of Solar Research, German Aerospace Center, 51147 Cologne, Germany and Faculty of Mechanical Science and Engineering, Institute of Power Engineering, Professorship of Solar Fuel production, TU Dresden, 01062 Dresden, Germany
| | - A Steinfeld
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
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Ezbiri M, Reinhart A, Huber B, Allen KM, Steinfeld A, Bulfin B, Michalsky R. High redox performance of Y0.5Ba0.5CoO3−δ for thermochemical oxygen production and separation. REACT CHEM ENG 2020. [DOI: 10.1039/c9re00430k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficient production and separation of oxygen is essential for numerous energy-intensive industrial applications in the fuel and mineral processing sectors.
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Affiliation(s)
- M. Ezbiri
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
| | - A. Reinhart
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
| | - B. Huber
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
| | - K. M. Allen
- Solar Technology Laboratory
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - A. Steinfeld
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
| | - B. Bulfin
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
| | - R. Michalsky
- Department of Mechanical and Process Engineering
- ETH Zürich
- 8092 Zürich
- Switzerland
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Mixed Metal Oxide Systems Applied to Thermochemical Storage of Solar Energy: Benefits of Secondary Metal Addition in Co and Mn Oxides and Contribution of Thermodynamics. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8122618] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Thermochemical energy storage is promising for the long-term storage of solar energy via chemical bonds using reversible redox reactions. The development of thermally-stable and redox-active materials is needed, as single metal oxides (mainly Co and Mn oxides) show important shortcomings that may delay their large-scale implementation in solar power plants. Drawbacks associated with Co oxide concern chiefly cost and toxicity issues while Mn oxide suffers from slow oxidation kinetics and poor reversibility. Mixed metal oxide systems could alleviate the above-mentioned issues, thereby achieving improved materials characteristics. All binary oxide mixtures of the Mn-Co-Fe-Cu-O system are considered in this study, and their properties are evaluated by experimental measurements and/or thermodynamic calculations. The addition of Fe, Cu or Mn to cobalt oxide decreased both the oxygen storage capacity and energy storage density, thus adversely affecting the performance of Co3O4/CoO. Conversely, the addition of Fe, Co or Cu (with added amounts above 15, 40 and 30 mol%, respectively) improved the reversibility, re-oxidation rate and energy storage capacity of manganese oxide. Computational thermodynamics was applied to unravel the governing mechanisms and phase transitions responsible for the materials behavior, which represents a powerful tool for predicting the suitability of mixed oxide systems applied to thermochemical energy storage.
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Singh AK, AuYeung NJ, Randhir K, Mishra R, Allen KM, Petrasch J, Klausner JF. Thermal Reduction of Iron Oxide under Reduced Pressure and Implications on Thermal Conversion Efficiency for Solar Thermochemical Fuel Production. Ind Eng Chem Res 2015. [DOI: 10.1021/ie504402x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Abhishek K. Singh
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, United States
| | - Nicholas J. AuYeung
- School
of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331, United States
| | - Kelvin Randhir
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, United States
| | - Rishi Mishra
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, United States
| | - Kyle M. Allen
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, United States
| | - Jörg Petrasch
- FH Vorarlberg, Hochschulstraße 1, 6850 Dornbirn, Austria
| | - James F. Klausner
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida 32611-6250, United States
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Ezbiri M, Allen KM, Gàlvez ME, Michalsky R, Steinfeld A. Design Principles of Perovskites for Thermochemical Oxygen Separation. CHEMSUSCHEM 2015; 8:1966-71. [PMID: 25925955 PMCID: PMC4831027 DOI: 10.1002/cssc.201500239] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 03/26/2015] [Indexed: 05/16/2023]
Abstract
Separation and concentration of O2 from gas mixtures is central to several sustainable energy technologies, such as solar-driven synthesis of liquid hydrocarbon fuels from CO2 , H2 O, and concentrated sunlight. We introduce a rationale for designing metal oxide redox materials for oxygen separation through "thermochemical pumping" of O2 against a pO2 gradient with low-grade process heat. Electronic structure calculations show that the activity of O vacancies in metal oxides pinpoints the ideal oxygen exchange capacity of perovskites. Thermogravimetric analysis and high-temperature X-ray diffraction for SrCoO3-δ , BaCoO3-δ and BaMnO3-δ perovskites and Ag2 O and Cu2 O references confirm the predicted performance of SrCoO3-δ , which surpasses the performance of state-of-the-art Cu2 O at these conditions with an oxygen exchange capacity of 44 mmol O 2 mol SrCoO 3-δ(-1) exchanged at 12.1 μmol O 2 min(-1) g(-1) at 600-900 K. The redox trends are understood due to lattice expansion and electronic charge transfer.
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Affiliation(s)
- Miriam Ezbiri
- Solar Technology Laboratory, Paul Scherrer Institute, 5232 Villigen-PSI (Switzerland)
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich (Switzerland)
| | - Kyle M Allen
- Solar Technology Laboratory, Paul Scherrer Institute, 5232 Villigen-PSI (Switzerland)
- Present address: Sandia National Laboratories, Livermore, CA 94550 (USA)
| | - Maria E Gàlvez
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich (Switzerland)
- Present address: Institut Jean Le Rond D'Alembert, Université Pierre et Marie Curie, 78210 Saint-Cyr-l'École (France)
| | - Ronald Michalsky
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich (Switzerland).
| | - Aldo Steinfeld
- Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich (Switzerland)
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Microfluidic aqueous two-phase extraction of bisphenol A using ionic liquid for high-performance liquid chromatography analysis. Anal Bioanal Chem 2015; 407:3617-25. [DOI: 10.1007/s00216-015-8572-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Revised: 02/12/2015] [Accepted: 02/17/2015] [Indexed: 11/26/2022]
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The Effect of Ceria on the Dynamics of CuO–Cu2O Redox Transformation: CuO–Cu2O Hysteresis on Ceria. Catal Letters 2014. [DOI: 10.1007/s10562-014-1237-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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