scholarly journals Reducing Reaction Temperature, Steam Requirements, and Coke Formation During Methane Steam Reforming Using Electric Fields: A Microkinetic Modeling and Experimental Study

ACS Catalysis ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 6957-6968 ◽  
Author(s):  
Fanglin Che ◽  
Jake T. Gray ◽  
Su Ha ◽  
Jean-Sabin McEwen
Keyword(s):  
Experimental Study ◽  
Electric Fields ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Coke Formation ◽  
Methane Steam Reforming ◽  
Microkinetic Modeling ◽  
Methane Steam

D207 Experimental study of methane steam reforming on planer SOFC anode at moderate temperature

2010 ◽  
Vol 2010.15 (0) ◽  
pp. 393-394
Author(s):  
Kentaro Morimoto ◽  
Masato Hamano ◽  
Hiroshi Iwai ◽  
Motohiro Saito ◽  
Hideo Yoshida
Keyword(s):  
Experimental Study ◽  
Steam Reforming ◽  
Moderate Temperature ◽  
Methane Steam Reforming ◽  
Methane Steam ◽  
Sofc Anode

scholarly journals Methane steam reforming at low temperature over Ni-MgO-Al2O3 catalysts: activity and resistance to coking

2018 ◽  
Vol 72 (2) ◽  
pp. 1
Author(s):  
Monika Pańczyk ◽  
Andrzej Denis ◽  
Kazimierz Stołecki ◽  
Tadeusz Krzysztof Borowiecki
Keyword(s):  
Steam Reforming ◽  
Specific Activity ◽  
Catalyst Activity ◽  
Coke Formation ◽  
Nickel Catalysts ◽  
Precipitation Method ◽  
Methane Steam Reforming ◽  
Deep Minimum ◽  
Methane Steam ◽  
Co Precipitation

<p>The role of MgO as a factor improving the resistance to coking of the alumina supported nickel catalysts in the steam reforming of hydrocarbons is discussed.    A series of catalysts containing variable amounts of MgO, NiO and a constant amount of Al<sub>2</sub>O<sub>3</sub> was prepared by the co-precipitation method. It was found that the specific activity of the catalysts exhibits a broad but not deep minimum for the MgO contents from 8.5 to 27.3 wt.%. At the same time these catalysts reveal a high resistance to coking either in the reaction with methane or with <em>n</em>-butane. The most promising composition, in terms of the activity and simultaneous resistance to the coke formation, was found to be 27.3 wt.% of MgO and 39.0 wt.% of NiO. The analysis of various factors controlling the activity and resistance to coking leads to the conclusion that MgO reduces the catalysts acidity what, in consequence, reduces the rate of coke formation during the reforming reactions. Furthermore, The resistance to coking correlates well with the mean size of nickel crystallites, the same is observed for the specific catalyst activity.</p><p> </p>

Ni/x%Nb2O5/Al2O3 Catalysts Prepared via Coprecipitation-Wet Impregnation Method for Methane Steam Reforming

2020 ◽  
Vol 9 (1) ◽  
pp. 80-89
Author(s):  
Juliana F. Gonçalves ◽  
Mariana M.V.M. Souza
Keyword(s):  
Steam Reforming ◽  
Methane Conversion ◽  
Coke Formation ◽  
Methane Steam Reforming ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
X Ray ◽  
Methane Steam ◽  
Temperature Programmed ◽  
Wet Impregnation Method

Background: Hydrogen has been considered the energy source of the future and one of the processes for its production is the methane steam reforming. The catalyst used industrially is Ni/Al2O3 and the addition of promoter oxides can be an alternative to improve the performance of this catalyst, which suffers from coke formation and sintering. Objective: Evaluate the role of niobia on catalytic activity and stability. Methods: Ni/x%Nb2O5/Al2O3 (x = 5, 10 and 20) catalysts were synthesized via coprecipitation-wet impregnation method and characterized by X-ray fluorescence (XRF), N2 adsorption-desorption, X-ray diffraction (XRD), temperature- programmed reduction (TPR), temperature-programmed desorption of ammonia (TPD-NH3), etc. Finally, the catalysts were tested for methane steam reforming reaction. Results: All niobia-doped catalysts presented similar values of methane conversion and when comparing with Ni-Al, the addition of niobia slightly improved the methane conversion. In the stability test at 800oC, all doped and non-doped catalysts did not deactivate during the 24 h of reaction. Conclusion: The addition of 10 and 20 wt.% of niobia had a significant promoter effect over Ni/Al2O3 catalyst in terms of activity and stability at 800 oC and the sample with 20 wt.% of niobia presented lower coke formation.

Kinetic Effects of Non-Equilibrium Plasma-Assisted Methane Steam Reforming on Heat Recovery in Chemically Recuperated Gas Turbine

2013 ◽  
Author(s):  
Qian Liu ◽  
Hongtao Zheng ◽  
Fumin Pan ◽  
Gang Pan ◽  
Ren Yang
Keyword(s):  
Kinetic Model ◽  
Reaction Temperature ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Heat Recovery ◽  
Methane Steam Reforming ◽  
Equilibrium Plasma ◽  
Methane Steam ◽  
Kinetic Effects ◽  
Non Equilibrium

Plasma is proposed as a prospective tool for chemical heat recovery process without restriction from reaction temperature. The author designed DBD catalytic reactors and carried out extensive experiments to investigate methane conversion and products yield and analyze the effect laws of steam to methane ratio, resident time and reaction temperature on methane steam reforming (MSR). Based on extensive experimental studies of steam reforming, a detailed reaction mechanism for the plasma-assisted MSR was developed and evaluated by comparison of experimentally derived and numerically predicted conversion and products yield. The comparisons showed the kinetic model well predicted methane conversion and products yield in different operating conditions. By employing the kinetic model and path flux analysis module the kinetic effects of low temperature non-equilibrium plasma assisted CH4 steam reforming on the methane conversion was studied without catalyst. The results showed that CH3 recombination was the limiting reaction for CO production; meantime O was the critical species for CO production. By adding Ni catalyst can reduce methyl recombination and promote hydroxyl into oxygen, which is beneficial to heat recovery. The proposed research ensures the effect laws and characters of MSR by plasma, and contribute to improve the objective products concentration and furthermore the energy efficiency.

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