A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction

Daniel J. Keene, Jane H Davidson, Wojciech Lipiński

Research output: Contribution to conferencePaper

Abstract

The redox chemistry of nonstoichiometric metal oxides can be used to produce chemical fuels by harnessing concentrated solar energy to split water and/or carbon dioxide. In such a process, it is desirable to use a porous reactive substrate for increased surface area and improved gas transport. The present study develops a macroscopic-scale model of porous ceria undergoing thermal reduction. The model captures the coupled interactions between the heat and mass transfer and the heterogeneous chemistry using a local thermal non-equilibrium (LTNE) formulation of the volume averaged conservation of mass and energy equations in an axisymmetric cylindrical domain. The results of a representative test case simulation demonstrate strong coupling between gas phase mass transfer and the chemical kinetics as well as the pronounced impact of optical thickness on the temperature distribution and thus global solar-to-chemical energy conversion.

Original languageEnglish (US)
Pages1121-1130
Number of pages10
DOIs
StatePublished - Jan 1 2012
EventASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology - San Diego, CA, United States
Duration: Jul 23 2012Jul 26 2012

Other

OtherASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
CountryUnited States
CitySan Diego, CA
Period7/23/127/26/12

Fingerprint

Cerium
Mass transfer
Heat transfer
Cerium compounds
Gases
Energy conversion
Reaction kinetics
Solar energy
Conservation
Carbon dioxide
Temperature distribution
Oxides
Substrates
Metals
Water
Hot Temperature
Oxidation-Reduction

Cite this

Keene, D. J., Davidson, J. H., & Lipiński, W. (2012). A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction. 1121-1130. Paper presented at ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, San Diego, CA, United States. https://doi.org/10.1115/ES2012-91380

A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction. / Keene, Daniel J.; Davidson, Jane H; Lipiński, Wojciech.

2012. 1121-1130 Paper presented at ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, San Diego, CA, United States.

Research output: Contribution to conferencePaper

Keene, DJ, Davidson, JH & Lipiński, W 2012, 'A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction' Paper presented at ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, San Diego, CA, United States, 7/23/12 - 7/26/12, pp. 1121-1130. https://doi.org/10.1115/ES2012-91380
Keene DJ, Davidson JH, Lipiński W. A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction. 2012. Paper presented at ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, San Diego, CA, United States. https://doi.org/10.1115/ES2012-91380
Keene, Daniel J. ; Davidson, Jane H ; Lipiński, Wojciech. / A model of transient heat and mass transfer in a heterogeneous medium of cerium dioxide undergoing nonstoichiometric reduction. Paper presented at ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology, San Diego, CA, United States.10 p.
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