Iodometric titration for determining the oxygen content of samples doped with Fe and Co

Chen, W.M.; Hong, Wan-Hae; Geng, Jianzhao; Wu, Xiaoshan; Wu, Jiangjiexing; Li, L.Y.; Qui, L.; X, Jin

doi:10.1016/s0921-4534(96)00501-1

Cited by 23 publications

(6 citation statements)

References 12 publications

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“…Iodometric titration [17,18] is easy to operate and can accurately measure oxygen non-stoichiometry. Therefore, oxygen non-stoichiometry of La 1−x Ca x Co 1−y Fe y O 3−δ (x = 0.2, 0.5, 0.8; y = 0.2, 0.5, 0.8) was measured using iodometric titration in this paper.…”

Section: Introductionmentioning

confidence: 99%

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Shen

Yang

et al. 2019

Energies

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Oxy-fuel combustion is one of the proposed technologies with the potential to achieve zero CO 2 emission. La 1−x Ca x Co 1−y Fe y O 3−δ (LCCF) perovskites are promising materials with high selectively for oxygen. In this study, the oxygen non-stoichiometry of perovskites LCCF was investigated by means of iodometric titration. LCCF was prepared using the liquid citrate method, and the phase structures were identified by X-ray diffraction. Fixed-bed experiments were performed to study the oxygen desorption performance of LCCF. The oxygen deficiency of LCCF increased with increasing Ca molar content of A site, but the value of δ of LCCF with increasing Fe molar content in B site is nearly constant. Experimental observation demonstrated that the O 2 release amount of LCCF does not depend on oxygen non-stoichiometry δ generated from A-site doping. At the same time, doping Fe in B site has an obvious impact on the oxygen desorption amount.

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Section: Introductionmentioning

confidence: 99%

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Shen

Yang

et al. 2019

Energies

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“…Since the effect was much larger than expected, our first thought was that the reduction of T c is caused by migration of oxygen from the YBCO into YBCu 3−x Co x O 7+δ , leaving the YBCO oxygen deficient, and hence with a lower T c . Fully oxygenated YBCu 3−x Co x O 7+δ contains more oxygen than YBCO, with the excess amount increasing with x [6]. If not enough oxygen is supplied during growth,then some oxygen may subsequently migrate from the YBCO into the YBCu T c should be further lowered.…”

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confidence: 99%

Role of interfaces in the proximity effect in anisotropic superconductors

et al. 1998

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We report measurements of the critical temperature of YBa 2 Cu 3 O 7 -YBCu 3-x Co x O 7ϩ␦ superconductornormal-metal (S-N) bilayer films. Depending on the morphology of the S-N interface, the coupling between S and N layers can be turned on to depress the T c of S by tens of degrees, or turned down so the layers appear almost totally decoupled. This effect can be explained by the mechanism of quasiparticle transmission into an anisotropic superconductor.

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“…The oxidation states of iron in the samples were determined by iodometric titration. , 20 mg portion of the sample powder was dissolved in dilute hydrochloric acid, and potassium iodide was added in an amount equal to ten times the molarity of Fe. The solution was then titrated with a defined-concentration ammonium thiosulfate solution in an N 2 -purged vessel.…”

Section: Methodsmentioning

confidence: 99%

New Triclinic Perovskite-Type Oxide Ba₅CaFe₄O₁₂ for Low-Temperature Operated Chemical Looping Air Separation

Ogawa,

Tamura,

Yamane

et al. 2023

J. Am. Chem. Soc.

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We present the discovery of Ba 5 CaFe 4 O 12 , a new ironbased oxide with remarkable properties as a low-temperature driven oxygen storage material (OSM). OSMs, which exhibit selective and rapid oxygen intake and release capabilities, have attracted considerable attention in chemical looping technologies. Specifically, chemical looping air separation (CLAS) has the potential to revolutionize oxygen production as it is one of the most crucial industrial gases. However, the challenge lies in utilizing OSMs for energy-efficient CLAS at lower temperatures. Ba 5 CaFe 4 O 12 , a cost-competitive material, possesses an unprecedented 5-fold perovskite-type A 5 B 5 O 15−δ structure, where both Fe and Ca occupy the B sites. This distinctive structure enables excellent oxygen intake/release properties below 400 °C. This oxide demonstrates the theoretical daily oxygen production rate of 2.41 m O2 3 kg OSM −1 at 370 °C, surpassing the performance of the previously reported material, Sr 0.76 Ca 0.24 FeO 3−δ (0.81 m O2 3 kg OSM −1 at 550 °C). This discovery holds great potential for reducing costs and enhancing the energy efficiency in CLAS.

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Iodometric titration for determining the oxygen content of samples doped with Fe and Co

Cited by 23 publications

References 12 publications

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Role of interfaces in the proximity effect in anisotropic superconductors

New Triclinic Perovskite-Type Oxide Ba₅CaFe₄O₁₂ for Low-Temperature Operated Chemical Looping Air Separation

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Iodometric titration for determining the oxygen content of samples doped with Fe and Co

Cited by 23 publications

References 12 publications

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Effect of A-/B-site Doping on Oxygen Non-Stoichiometry, Structure characteristics, and O2 Releasing Behavior of La1−xCaxCo1−yFeyO3−δ Perovskites

Role of interfaces in the proximity effect in anisotropic superconductors

New Triclinic Perovskite-Type Oxide Ba5CaFe4O12 for Low-Temperature Operated Chemical Looping Air Separation

Contact Info

Product

Resources

About

New Triclinic Perovskite-Type Oxide Ba₅CaFe₄O₁₂ for Low-Temperature Operated Chemical Looping Air Separation