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Supported Perovskite-type Oxides: Establishing a Foundation for CO2 Conversion through Reverse Water-Gas Shift Chemical Looping
Başlık:
Supported Perovskite-type Oxides: Establishing a Foundation for CO2 Conversion through Reverse Water-Gas Shift Chemical Looping
Yazar:
Hare, Bryan J., author.
ISBN:
9780355983692
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (50 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: John N. Kuhn; Venkat R. Bhethanabotla Committee members: Scott W. Campbell.
Özet:
Perovskite-type oxides show irrefutable potential for feasible thermochemical solar-driven CO2 conversion. These materials exhibit the exact characteristics required by the low temperature reverse water-gas shift chemical looping process. These properties include structural endurance and high oxygen redox capacity, which results in the formation of numerous oxygen vacancies, or active sites for CO2 conversion. A major drawback is the decrease in oxygen self-diffusion with increasing perovskite particle size. In this study, the La0.75Sr0.25FeO3 (LSF) perovskite oxide was combined with various supports including popular redox materials CeO 2 and ZrO2 along with more abundant alternatives such as Al2O3, SiO2, and TiO2, in view of its potential application at industrial scale. Supporting LSF on SiO 2 by 25% mass resulted in the largest increase of 150% in CO yields after reduction at 600 °C. This result was a repercussion of significantly reduced perovskite particle size confirmed by SEM/TEM imaging and Scherrer analyses of XRD patterns. Minor secondary phases were observed during the solid-state reactions at the interface of SiO2 and TiO2. Density functional theory-based calculations, coupled with experiments, revealed oxygen vacancy formation only on the perovskite phase at these low temperatures of 600 °C. The role of each metal oxide support towards suppressing or enhancing the CO2 conversion has been elucidated. Through utilization of SiO2, the reverse water-gas shift chemical looping process using perovskite-based composites was significantly improved.
Notlar:
School code: 0206
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