A chemical looping process for hydrogen production using iron-containing perovskites

Murugan, Arul; Thursfield, Alan; Metcalfe, Ian S.

doi:10.1039/c1ee02142g

Cited by 91 publications

(64 citation statements)

References 36 publications

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“…22 (Partial) oxidation of methane is generally a reaction that has been vastly studied on many different perovskite systems, 53−58 but almost always using a chemical looping pulse technique at higher reaction temperatures. Summarizing—in close correlation to the results presented here—oxygen nonstoichiometry has been elucidated as the key parameter governing the activity and stability.…”

Section: Results and Discussionmentioning

confidence: 99%

Water-Gas Shift and Methane Reactivity on Reducible Perovskite-Type Oxides

et al. 2015

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Comparative (electro)catalytic, structural, and spectroscopic studies in hydrogen electro-oxidation, the (inverse) water-gas shift reaction, and methane conversion on two representative mixed ionic–electronic conducting perovskite-type materials La0.6Sr0.4FeO3−δ (LSF) and SrTi0.7Fe0.3O3−δ (STF) were performed with the aim of eventually correlating (electro)catalytic activity and associated structural changes and to highlight intrinsic reactivity characteristics as a function of the reduction state. Starting from a strongly prereduced (vacancy-rich) initial state, only (inverse) water-gas shift activity has been observed on both materials beyond ca. 450 °C but no catalytic methane reforming or methane decomposition reactivity up to 600 °C. In contrast, when starting from the fully oxidized state, total methane oxidation to CO2 was observed on both materials. The catalytic performance of both perovskite-type oxides is thus strongly dependent on the degree/depth of reduction, on the associated reactivity of the remaining lattice oxygen, and on the reduction-induced oxygen vacancies. The latter are clearly more reactive toward water on LSF, and this higher reactivity is linked to the superior electrocatalytic performance of LSF in hydrogen oxidation. Combined electron microscopy, X-ray diffraction, and Raman measurements in turn also revealed altered surface and bulk structures and reactivities.

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Section: Results and Discussionmentioning

confidence: 99%

Water-Gas Shift and Methane Reactivity on Reducible Perovskite-Type Oxides

et al. 2015

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“…A decline in H 2 production and carbon deposition for co-precipitated iron oxide and supported nickel oxide was observed. La 0.7 Sr 0.3 FeO 3 was shown to have the best performance over a large number of cycles (Murugan et al, 2011).…”

Section: Iron And/or Cobalt Groupmentioning

confidence: 99%

Perovskite ceramics and recent experimental progress in reactor design for chemical looping combustion application

2015

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Chemical looping combustion (CLC) is a novel method of carbon capture and sequestration. It facilitates CO2 capture by lower energy penalties compared with other methods in this category. The major challenges encountered in CLC are oxygen carrier, reactor and fuel-type selection. A proper combination of these factors is required for an efficient CLC. There have been several studies with regard to oxygen carriers applicable to these processes: novel oxygen carriers, single perovskites and potential oxygen carriers, double perovskites, have been investigated for their oxygen capture and release properties in a number of studies. Different kinds of reactors have also been proposed for use in CLC processes. This paper presents information on the materials capable of oxygen storage and release and the different kinds of reactors investigated for CLC in different studies. It has been shown that, although there are several oxygen carriers and reactors with the desired function and efficiency for CLC, there remains the need for further improvement and optimisation in both areas.

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“…The generation of hydrogen competes with the disproportionation of formaldehyde to form corresponding alcohol and acid [75,76]. Further, Ashby et al [77] proposed a mechanistic explanation of this process. The mechanism indicates that one hydrogen atom originates from the water and the other from the organic moiety.…”

Section: Formaldehyde (Hcho)mentioning

confidence: 99%

“…The mechanism indicates that one hydrogen atom originates from the water and the other from the organic moiety. According to an experimental study, when a dilute solution of formaldehyde (4 × 10 −4 m) reacts with concentrated sodium hydroxide (19 m) at room temperature, hydrogen is produced in a significant amount [77]. However, when concentrated solution of formaldehyde interacts with dilute sodium hydroxide solution, only a trace amount of hydrogen is produced.…”

Section: Formaldehyde (Hcho)mentioning

confidence: 99%

Clean Hydrogen Production Methods

Kumar

2015

SpringerBriefs in Energy

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A chemical looping process for hydrogen production using iron-containing perovskites

Cited by 91 publications

References 36 publications

Water-Gas Shift and Methane Reactivity on Reducible Perovskite-Type Oxides

Water-Gas Shift and Methane Reactivity on Reducible Perovskite-Type Oxides

Perovskite ceramics and recent experimental progress in reactor design for chemical looping combustion application

Clean Hydrogen Production Methods

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