Combined Partial Oxidation of Methane to Synthesis Gas and Production of Hydrogen or Carbon Monoxide in a Fluidized Bed using Lattice Oxygen
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Abstract:
Perovskite‐based oxygen carriers have shown promise for the partial oxidation of methane in fixed bed reactors, but they have not been investigated in detail in bubbling fluidized bed reactors, where bypassing of the methane and backmixing of the product gas can occur. Herein, using a lanthanum strontium ferrite (La 0.85 Sr 0.15 FeO 3 ) as the oxygen carrier, it is demonstrated that excellent performance can be achieved in a fluidized bed reactor for both the partial oxidation of methane during reduction of the oxygen carrier and the carbon dioxide or water‐splitting reactions during reoxidation of the oxygen carrier in a chemical looping fashion. The effective oxygen storage capacity is >10 wt%, allowing to produce >6 mol of synthesis gas with a ratio of hydrogen to carbon monoxide slightly below 2 during partial oxidation, and >6 mol of carbon monoxide or hydrogen during reoxidation per kilogram of oxygen carrier in a complete redox cycle. The selectivity toward synthesis gas is >99% and the conversion of carbon dioxide to carbon monoxide (or steam to hydrogen) is ≈97% (or ≈94%) at temperatures >900 °C.Keywords:
Chemical-Looping Combustion
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Partial pressure
Partial oxidation
Partial pressure
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The influence of reactor temperature,ratio of oxygen to methane and stuff flux under no catalyze and normal pressure condition on carbon deposit and syngas from methane by partial oxidation was studied.The reaction mechanism of the production of syngas from methane is deduced after analyzing the influence of reactor temperature to the process,which is dominated by partial oxidation reaction and is assisted by reforming reaction.
Partial oxidation
Partial pressure
Methane reformer
Carbon dioxide reforming
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The partial oxidation of methane to synthesis gas is studied in this paper over Ni/Al2O3 catalysts under atmospheric pressure. The effects of Ni loading on the activity and stability of catalysts with 5 mm α-Al2O3 and θ-Al2O3 pellets as supports were measured in a continuous fixed bed reactor. It is found that the optimum Ni loading is 10%. And the effect of reaction conditions on partial oxidation of methane is also studied. The methane conversion and CO selectivity increase with the increase of the reaction temperature and the space velocity on 10%Ni/α-Al2O3 catalysts. The best CH4/O2 mole ratio is 2 for CO selectivity, and the optimum space velocity is 5.4×105 h-1.
Partial oxidation
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Carbon dioxide reforming
Partial oxidation
Partial pressure
Methane reformer
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Partial oxidation
Partial pressure
Methane reformer
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Chemical-Looping Combustion
Oxidizing agent
Partial oxidation
Non-blocking I/O
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Chemical-Looping Combustion
Partial oxidation
Methane reformer
Carbon dioxide reforming
Non-blocking I/O
Carbon fibers
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Chemical-Looping Combustion
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Partial oxidation
Partial pressure
Methane reformer
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Partial oxidation
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