Thermochemical stability of LaxSr1-xCoyFe1-yO3-δ and NiFe2O4-Ce0.8Tb0.2O2-δ under real conditions for its application in oxygen transport membranes for oxyfuel combustion

Bermúdez, J.M.; García‐Fayos, Julio; Reina, Tomás Ramírez; Reed, G. P.; Persoon, E. S.; Görtz, Daniel; Schroeder, Michael A.; Millán, Marcos; Serra, José M.

doi:10.1016/j.memsci.2018.05.012

Cited by 22 publications

(15 citation statements)

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“…As can be seen in Fig. (a), the spectra included peaks corresponding to newly formed carbonate phases (CoCO 3 , FeCO 3 and SrCO 3 ), and sulfate phases (SrS and SrSO 4 ), and even trace elements such as ZnO. Therefore, the presence of species that originated from the aggressive atmospheres employed in the experimental tests appeared to have altered the crystalline structures of the samples.…”

Section: Resultsmentioning

confidence: 97%

“…(a). In agreement with results reported previously, typical diffraction peaks attributed to the LSCF phase were observed in the XRD pattern of the fresh sample. The XRD patterns of the treated samples also included peaks attributable to the LSCF phase.…”

Section: Resultsmentioning

confidence: 99%

“…(b) indicate the carboxylation of the treated LSCF samples, with broad peaks at 850 and 1424 cm −1 . These bands typically are attributed to C═O groups . The spectra also included other broad peaks at 1056, 1060 and 927 cm −1 related to the formation of sulfates, which can be assigned to the S = 0 groups, as well as peaks at 694 cm −1 , which can be attributed to the C─S groups.…”

Section: Resultsmentioning

confidence: 99%

“…The Raman spectra of the treated samples revealed a decrease in the intensity of the peaks compared to the four characteristic peals of the fresh sample, located at ≈467, 566, 648 and 692 cm −1. The spectra also included new peaks related to the formation of carbonates and sulfates under exposure of the treated samples to the various abrasive atmospheres. In the 1073–1455 cm −1 region, the spectra contained typical bands corresponding to SrCO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the OTM unit can be integrated into the oxy‐combustion process downstream from the gas treatment process, which makes this design feasible to implement . The other design is the four‐end design, wherein a sweep stream on the permeate side circulates into side opposite the air feed side, to provide the necessary driving force . This sweep stream is composed of recirculated flue gas; therefore, the OTM material has to be stable against acid gases [CO 2 , sulfur dioxide (SO 2 ) and nitrous oxides (NO x )], humidity and trace elements that are present during the oxy‐combustion process.…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical evaluation of oxygen transport membranes under oxy‐combustion conditions in a pilot‐scale facility

Portillo

Cano

Fernández

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Control of greenhouse gas emissions has become one of the most important challenges faced by humanity. Among the various approaches to mitigating CO2 emissions, carbon capture and storage (CCS) is considered one of the most promising clean coal options for the future because it can be implemented in the short and medium terms at the industrial scale. Among CCS techniques, oxy‐combustion offers advantages in using pure oxygen (O2) as a comburent, where in a flue gas composed mainly of CO2 and water vapor is generated. Cryogenic air separation is the only available technology that can provide the required amount of O2, but this process requires large amounts of energy and is costly, which make its large‐scales implementation difficult. RESULTS In this framework, oxygen transport membranes are being researched as an O2 supplier unit because they offer advantages from a techno‐economic view point. In the present work, the thermochemical stabilities of La0.6Sr0.4Co0.2Fe0.8O3 and Cobalt‐doped Ce0.9Gd0.1O were evaluated to obtain information on their behavior in oxy‐combustion atmospheres. Experiments were performed in a circulating fluidized bed boiler of a pilot plant using an experimental sampling train. Samples of the two materials were characterized by X‐ray diffraction, X‐ray fluorescence, infrared spectroscopy, Raman spectroscopy, scanning electron microscopy with energy‐dispersive X‐ray spectroscopy, and Brunauer–Emmett–Teller analysis. CONCLUSIONS The results revealed that both materials were susceptible to the presence of species that originated from flue gas, materials comprising the boiler and ducts, and coal ash, and that the CGO_Co material showed better performance than the other studied material. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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