Effect of surface decoration with LaSrFeO4 on oxygen mobility and catalytic activity of La0.4Sr0.6FeO3−δ in high-temperature N2O decomposition, methane combustion and ammonia oxidation

Иванов, Д. В.; Пинаева, Л. Г.; Исупова, Л. А.; Sadovskaya, E. M.; Prosvirin, Igor P.; Yakovleva, I. L.

doi:10.1016/j.apcata.2013.03.007

Cited by 48 publications

(38 citation statements)

References 37 publications

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“…Combined the above results, it suggests that undercoordinated iron species may play the main role in methane activation. Besides, it was reported that the oxide shell with double perovskite structure exhibited higher surface oxygen exchange rate and oxygen mobility than pure perovskite oxide 46 , which also contributes to the increased reactivity. In a word, the in situ encapsulation of metallic Fe 0 by oxide layer during methane-tosyngas process can not only improve the CO selectivity by prohibiting carbon deposition but also notably promote the syngas production efficiency.…”

Section: Resultsmentioning

confidence: 99%

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

Huang

Chen

et al. 2018

Commun Chem

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Methane-to-syngas conversion plays an important role in industrial gas-to-liquid technologies, which is commercially fulfilled by energy-intensive reforming methods. Here we present a highly selective and durable iron-based La 0.6 Sr 0.4 Fe 0.8 Al 0.2 O 3-δ oxygen carrier for syngas production via a solar-driven thermochemical process. It is found that a dynamic structural transformation between the perovskite phase and a Fe 0 @oxides core-shell composite occurs during redox cycling. The oxide shell, acting like a micro-membrane, avoids direct contact between methane and fresh iron(0), and prevents coke deposition. This core-shell intermediate is regenerated to the original perovskite structure either in oxygen or more importantly in H 2 O-CO 2 oxidant with simultaneous generation of another source of syngas. Doping with aluminium cations reduces the surface oxygen species, avoiding overoxidation of methane by decreasing oxygen vacancies in perovskite matrix. As a result, this material exhibits high stability with carbon monoxide selectivity above 95% and yielding an ideal syngas of H 2 /CO ratio of 2/1.

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Section: Resultsmentioning

confidence: 99%

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

Huang

Chen

et al. 2018

Commun Chem

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“…For this reason, the development of alternative catalysts based on non‐noble metals is attractive . These include single metal oxide–based catalysts (CuO, Co 3 O 4 , and MnO 2 ), perovskite, spinel, and hexaaluminate catalysts. Among these, Co 3 O 4 exhibits good activity for methane combustion attributed to a spinel‐type structure with variable Co oxidation states and a high density of oxygen vacancies on the surface .…”

Section: Introductionmentioning

confidence: 99%

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

Dai

Kumar

Zhu

et al. 2019

Adv Funct Materials

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Bowtie-shaped NiCo 2 O 4 nanostructures are prepared using a hydrothermal method. Variation of the synthesis parameters, including reaction time, additives, and calcination temperature, allows an understanding of the origin of the bowtie-shaped structure to be developed. Methane oxidation experiments performed using temperature-programed oxidation (TPO) show that the new materials, which do not contain precious metals, have excellent activity for low-temperature methane combustion, with 100% conversion at ≈410 °C (gas hourly space velocity (GHSV): 90 000 mL (STP) g −1 h −1 ). The structure-activity relationships of the bowtie-shaped nanostructures are explored. The relatively low exhaust temperature in NGVs means that the activation of methane, which has the strongest CH bond of any hydrocarbon, is challenging from a chemical perspective. It is not surprising that the quest for effective lowtemperature methane oxidation catalysts has focused mainly on systems involving precious metals, such as platinum and palladium. [11][12][13][14][15] Metal oxidesupported PdO catalysts are generally considered to represent the state of the art for methane combustion catalysts. [16][17][18][19][20] Recent research in this field has focused on improving activity at low temperatures, [21,22] reducing the required loading of metal [23,24] and improving the thermal and hydrothermal stability of PdO catalysts. [25][26][27][28][29][30] Exciting recent advances include the development of core-shell Pd@CeO 2 catalysts with high activity and thermal stability, demonstrating complete conversion to CO 2 below 400 °C (gas hourly space velocity (GHSV) = 200 000 mL g −1 h −1 ). [21] Pd@ZrO 2 /Si-Al 2 O 3 catalysts that are stable in the presence of high concentrations of water vapor have also been proposed recently. [25] NiO@PdO/Al 2 O 3 catalysts that show good activity and stability with only 0.2 wt% Pd loading have been prepared [23] as well as Pd-based bimetallic nanocrystalline catalysts, in which the promotional effects of different transition metals have been examined. [26] Although Pd-based catalysts show excellent activity, the high price and low abundance of palladium are limiting factors to practical application, [31] and both the hydrothermal stability and SO 2 tolerance for these catalysts need to be improved. For this reason, the development of alternative catalysts based on non-noble metals is attractive. [32] These include single metal oxide-based catalysts (CuO, [33] Co 3 O 4 , [34] and MnO 2 [35] ), perovskite, [36,37] spinel, [38,39] and hexaaluminate [40] catalysts. Among these, Co 3 O 4 exhibits good activity for methane combustion attributed to a spinel-type structure with variable Co oxidation states and a high density of oxygen vacancies on the surface. [41] Additionally, the specific exposed facets and morphology of Co 3 O 4 plays an important role in the catalysis. [42,43] Materials with exposed (110) planes show enhanced catalytic activity for methane oxidation compared with those only exposing (100) or (111) face...

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“…According to the previous reports, Co, Fe 7 Co 3 , La 2 O 3 and LaSrFeO 4 show good catalytic activities [16,[19][20][21][22]. On the other hand, the elemental Co and Co- Fe alloy particles can contribute to the electrical conductivity as well as catalysis to hydrogen oxidation inside the porous anode [16,19].…”

Section: Resultsmentioning

confidence: 88%

Investigation on a novel composite solid oxide fuel cell anode with La0.6Sr0.4Co0.2Fe0.8O3−δ derived phases

Zhu

Wei

Lü

et al. 2015

Electrochimica Acta

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Effect of surface decoration with LaSrFeO4 on oxygen mobility and catalytic activity of La0.4Sr0.6FeO3−δ in high-temperature N2O decomposition, methane combustion and ammonia oxidation

Cited by 48 publications

References 37 publications

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

Investigation on a novel composite solid oxide fuel cell anode with La0.6Sr0.4Co0.2Fe0.8O3−δ derived phases

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Effect of surface decoration with LaSrFeO4 on oxygen mobility and catalytic activity of La0.4Sr0.6FeO3−δ in high-temperature N2O decomposition, methane combustion and ammonia oxidation

Cited by 48 publications

References 37 publications

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

In situ encapsulation of iron(0) for solar thermochemical syngas production over iron-based perovskite material

Bowtie‐Shaped NiCo2O4 Catalysts for Low‐Temperature Methane Combustion

Investigation on a novel composite solid oxide fuel cell anode with La0.6Sr0.4Co0.2Fe0.8O3−δ derived phases

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Product

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Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion