Partial oxidation of CH4 with air to produce pure hydrogen and syngas

Nakayama, Osami; Ikenaga, Naoki; Miyake, Takanori; Yagasaki, Eriko; Suzuki, Toshimitsu

doi:10.1016/j.cattod.2008.05.013

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…Baran et al reported that bulk lattice oxygen is only active at relatively high temperature, and contributes to CO production in the CH 4 reaction. Figure b shows the slight increasing of CO concentration above 750 °C and similar phenomena were also observed in the earlier studies by Pantu et al, Dai et al, and Nakayama et al Additionally, CO concentration for the oxygen carrier modified by KNO 3 is apparently lower than pure Fe 2 O 3 , indicating that KNO 3 can inhibit partial oxidation of methane to CO and H 2 .…”

Section: Resultssupporting

confidence: 86%

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

Cheng

Wei

et al. 2017

Can J Chem Eng

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This work presented a comparative study on the Fe2O3‐based oxygen carriers modified by different potassium salts (i.e. KNO3, K3PO4, KOH, K2CO3) for chemical looping combustion of methane (CLC with methane). The effect of Al2O3 support on the reactivity of Fe2O3 was also investigated. The Fe2O3‐based oxygen carriers were prepared by a co‐precipitation method and the potassium salts were added via an incipient wetness impregnation method. The obtained oxygen carriers were characterized by XRD, XPS, H2‐TPR, and CH4‐TPR technologies. It was found that the presence of KNO3 could improve the reducibility of the Fe2O3‐based oxygen carrier in the surface, resulting in relatively high selectivity towards CO2 during the CLC with methane. The content of KNO3 also affected the reactivity of oxygen carriers, and 10 % KNO3/Fe2O3 sample showed the best activity. Moreover, it was also demonstrated that the addition of Al2O3 support into the 10 % KNO3/Fe2O3 oxygen carrier could improve its redox performance, and the stability of 10 % KNO3/Fe2O3/Al2O3 was proved to be favourable after twenty successive cycles for CLC with methane.

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Section: Resultssupporting

confidence: 86%

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

Cheng

Wei

et al. 2017

Can J Chem Eng

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“…Typically, the NiO-based catalysts exhibit acceptable CO selectivity (~90%) as shown in Entries 4 and 5, but large amount of H 2 O is required in the feedstock to suppress carbon deposition and overoxidation of methane, leading to H 2 /CO ratio much higher than 2 31,32 . LaFeO 3 exhibits an initial CO selectivity of~96% under optimized conditions as shown in Entry 8, but the quantity of CO 2 increases and the deactivation is observed after only 7 cycles due to sintering of material 30,33,34 . The recently developed irontitanium composite oxide (Entry 10) shows steady activity for several hours in the moving bed reactor 35 .…”

Section: Resultsmentioning

confidence: 97%

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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“…In addition, the chemical changes of oxides during the reaction have not been well understood. We have surveyed several complex metal oxides reactive for reaction (9) and durable for re-oxidation after the reaction, and found that Fe-and Ni-based complex oxides are very active and durable [28,29].…”

Section: Development Of New Oxide Materials For Hydrogen or Synthesismentioning

confidence: 99%

Partial Oxidation of Methane to Nitrogen Free Synthesis Gas Using Air as Oxidant

2012

Self Cite

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In order to generate synthesis gas or hydrogen free from nitrogen by partial oxidation of methane using air as an oxidant, gas-solid reactions of methane and a metal oxide and/ or mixed metal oxides were carried out. The background of the gas-solid reaction was briefly reviewed and then a series of the present author's studies was described. As metal oxides Fe 2 O 3 and NiO were active, but the reaction with methane and these oxides afforded complete oxidation to give H 2 O and CO 2 . To both oxides, addition of Cr-and Mg-oxides promoted the following reaction to give synthesis gas.After the reaction with methane, mixed oxides were reduced to lower valence state oxides and they were regenerated by the oxidation with air.

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Partial oxidation of CH4 with air to produce pure hydrogen and syngas

Cited by 18 publications

References 23 publications

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

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

Partial Oxidation of Methane to Nitrogen Free Synthesis Gas Using Air as Oxidant

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Partial oxidation of CH4 with air to produce pure hydrogen and syngas

Cited by 18 publications

References 23 publications

Modification of KNO3 on the reducibility and reactivity of Fe2O3‐based oxygen carriers for chemical‐looping combustion of methane

Modification of KNO3 on the reducibility and reactivity of Fe2O3‐based oxygen carriers for chemical‐looping combustion of methane

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

Partial Oxidation of Methane to Nitrogen Free Synthesis Gas Using Air as Oxidant

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Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane

Modification of KNO₃ on the reducibility and reactivity of Fe₂O₃‐based oxygen carriers for chemical‐looping combustion of methane