Theoretical and Experimental Investigation of Solar Methane Reforming through the Nonstoichiometric Ceria Redox Cycle.
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| Title: | Theoretical and Experimental Investigation of Solar Methane Reforming through the Nonstoichiometric Ceria Redox Cycle. |
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| Authors: | Warren, Kent J.1, Reim, Julie1, Randhir, Kelvin1, Greek, Benjamin1, Carrillo, Richard1, Hahn, David W.1, Scheffe, Jonathan R.1 jscheffe@ufl.edu |
| Source: | Energy Technology. Nov2017, Vol. 5 Issue 11, p2138-2149. 12p. |
| Subject Terms: | *Methane, Stoichiometry, Cerium oxides |
| Abstract: | The dry reforming of methane through the nonstoichiometric ceria (CeO2-CeO2− δ) redox cycle was examined theoretically and experimentally for converting high-temperature, solar process heat to syngas. The aforementioned cycle is composed of: (1) endothermic reduction of ceria and simultaneous partial oxidation of methane and (2) exothermic oxidation of the reduced ceria and simultaneous reduction of CO2. In both steps, chemical equilibrium calculations indicate that isothermal operation is thermodynamically favorable under a wide range of conditions. The influence of the total amount of reactive gas, the operating temperature, and the inclusion of gas- or solid-phase heat exchangers on the cycle performance was determined through a holistic process model. A theoretical solar-to-fuel conversion efficiency, defined as the ratio of the difference between the calorific value of syngas (H2 and CO) produced and methane converted to the total solar radiative input energy, of more than 45 % was predicted with no heat recuperation. Experimental validation was subsequently demonstrated in a packed-bed-type solar reactor using the high-flux solar simulator at the University of Florida at three discrete isothermal temperatures, namely, 950, 1035, and 1120 °C. Upon the completion of the reduction at each temperature, the bed-averaged oxygen nonstoichiometry equaled 0.07, 0.21, and 0.24, which yielded methane conversions of 9, 41, and 51 %, respectively. At 1120 °C, the extrapolated solar-to-fuel conversion efficiency was 9.82 %. [ABSTRACT FROM AUTHOR] |
| Copyright of Energy Technology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 126172433 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Theoretical and Experimental Investigation of Solar Methane Reforming through the Nonstoichiometric Ceria Redox Cycle. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Warren%2C+Kent+J%2E%22">Warren, Kent J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Reim%2C+Julie%22">Reim, Julie</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Randhir%2C+Kelvin%22">Randhir, Kelvin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Greek%2C+Benjamin%22">Greek, Benjamin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Carrillo%2C+Richard%22">Carrillo, Richard</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hahn%2C+David+W%2E%22">Hahn, David W.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Scheffe%2C+Jonathan+R%2E%22">Scheffe, Jonathan R.</searchLink><relatesTo>1</relatesTo><i> jscheffe@ufl.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energy+Technology%22">Energy Technology</searchLink>. Nov2017, Vol. 5 Issue 11, p2138-2149. 12p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Stoichiometry%22">Stoichiometry</searchLink><br /><searchLink fieldCode="DE" term="%22Cerium+oxides%22">Cerium oxides</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The dry reforming of methane through the nonstoichiometric ceria (CeO2-CeO2− δ) redox cycle was examined theoretically and experimentally for converting high-temperature, solar process heat to syngas. The aforementioned cycle is composed of: (1) endothermic reduction of ceria and simultaneous partial oxidation of methane and (2) exothermic oxidation of the reduced ceria and simultaneous reduction of CO2. In both steps, chemical equilibrium calculations indicate that isothermal operation is thermodynamically favorable under a wide range of conditions. The influence of the total amount of reactive gas, the operating temperature, and the inclusion of gas- or solid-phase heat exchangers on the cycle performance was determined through a holistic process model. A theoretical solar-to-fuel conversion efficiency, defined as the ratio of the difference between the calorific value of syngas (H2 and CO) produced and methane converted to the total solar radiative input energy, of more than 45 % was predicted with no heat recuperation. Experimental validation was subsequently demonstrated in a packed-bed-type solar reactor using the high-flux solar simulator at the University of Florida at three discrete isothermal temperatures, namely, 950, 1035, and 1120 °C. Upon the completion of the reduction at each temperature, the bed-averaged oxygen nonstoichiometry equaled 0.07, 0.21, and 0.24, which yielded methane conversions of 9, 41, and 51 %, respectively. At 1120 °C, the extrapolated solar-to-fuel conversion efficiency was 9.82 %. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Energy Technology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/ente.201700083 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 2138 Subjects: – SubjectFull: Methane Type: general – SubjectFull: Stoichiometry Type: general – SubjectFull: Cerium oxides Type: general Titles: – TitleFull: Theoretical and Experimental Investigation of Solar Methane Reforming through the Nonstoichiometric Ceria Redox Cycle. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Warren, Kent J. – PersonEntity: Name: NameFull: Reim, Julie – PersonEntity: Name: NameFull: Randhir, Kelvin – PersonEntity: Name: NameFull: Greek, Benjamin – PersonEntity: Name: NameFull: Carrillo, Richard – PersonEntity: Name: NameFull: Hahn, David W. – PersonEntity: Name: NameFull: Scheffe, Jonathan R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 21944288 Numbering: – Type: volume Value: 5 – Type: issue Value: 11 Titles: – TitleFull: Energy Technology Type: main |
| ResultId | 1 |
