Development and characterization of novel reduction-oxidation active materials for two-step solar thermochemical cycles

dc.contributor.advisor Loutzenhiser, Peter G.
dc.contributor.author Bush, Hagan E.
dc.contributor.committeeMember Jeter, Sheldon
dc.contributor.committeeMember Kumar, Satish
dc.contributor.committeeMember Orlando, Thomas
dc.contributor.committeeMember Ranjan, Devesh
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2019-08-21T13:51:22Z
dc.date.available 2019-08-21T13:51:22Z
dc.date.created 2019-08
dc.date.issued 2019-05-21
dc.date.submitted August 2019
dc.date.updated 2019-08-21T13:51:22Z
dc.description.abstract Solar thermochemistry enables concentrating solar technologies to store or produce energy and materials in new, more versatile ways. In this work, binary and perovskite metal oxide candidates for high-temperature reduction-oxidation (redox) thermochemical cycles were synthesized and characterized to determine their potential for solar applications. First, the experimental infrastructure required to study rapidly reacting, high temperature metal oxides was developed. A high flux solar simulator (HFSS) capable of rapid heating was coupled to an upward flow reactor (UFR) to thermally reduce oxide samples, and O2 product gas flows were measured to calculate thermal reduction rates. The radiative input from the HFSS was characterized and coupled to computational models of the UFR to predict gas dynamics and redox sample heating. Dispersion modeling was used to correct temporal O2 measurements downstream of reducing samples. Thermal reduction experiments with the well-studied binary oxide pair Co3O4/CoO were performed to validate the computational models. Next, the UFR and a thermogravimetric analyzer (TGA) were used to evaluate candidate materials. Fe2O3/Fe3O4 were kinetically characterized via TGA and evaluated in thermodynamic cycle models. The results suggested the oxides were promising candidates for solar thermochemical electricity production. Al-doped SrFeO3-δ was synthesized and reaction models were developed with TGA to predict equilibrium nonstoichiometry and redox thermodynamics. The results were incorporated into a thermodynamic cycle model, and redox cycling experiments were performed in the UFR. The analyses determined that the oxides were well-suited to air separation for NH3 production.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/61704
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Air separation
dc.subject Concentrating solar
dc.subject Compound energy formalism
dc.subject Computational fluid dynamics
dc.subject Dispersion High flux solar simulator
dc.subject Iron oxide
dc.subject Kinetic
dc.subject Monte Carlo ray tracing
dc.subject Perovskite
dc.subject Strontium ferrite
dc.subject Thermochemistry
dc.subject Thermochemical energy storage
dc.subject Thermodynamic
dc.subject Thermogravimetry
dc.subject Upward flow reactor
dc.title Development and characterization of novel reduction-oxidation active materials for two-step solar thermochemical cycles
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Loutzenhiser, Peter G.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 97a4b763-af4e-4b74-bfb3-78a50b72c8c4
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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