scholarly journals A Study on CO2 Methanation and Steam Methane Reforming over Commercial Ni/Calcium Aluminate Catalysts

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2792 ◽  
Author(s):  
Gabriella Garbarino ◽  
Federico Pugliese ◽  
Tullio Cavattoni ◽  
Guido Busca ◽  
Paola Costamagna
Keyword(s):  
Steam Reforming ◽  
Operating Conditions ◽  
Packed Bed Reactor ◽  
Methane Steam Reforming ◽  
Hydrogen Yield ◽  
Reactor Model ◽  
Co2 Methanation ◽  
Methane Steam ◽  
Reforming Catalysts ◽  
Steam Reforming Catalysts

Three Ni-based natural gas steam reforming catalysts, i.e., commercial JM25-4Q and JM57-4Q, and a laboratory-made catalyst (26% Ni on a 5% SiO2–95% Al2O3), are tested in a laboratory reactor, under carbon dioxide methanation and methane steam reforming operating conditions. The laboratory catalyst is more active in both CO2 methanation (equilibrium is reached at 623 K with 100% selectivity) and methane steam reforming (92% hydrogen yield at 890 K) than the two commercial catalysts, likely due to its higher nickel loading. In any case, commercial steam reforming catalysts also show interesting activity in CO2 methanation, reduced by K-doping. The interpretation of the experimental results is supported by a one-dimensional (1D) pseudo-homogeneous packed-bed reactor model, embedding the Xu and Froment local kinetics, with appropriate kinetic parameters for each catalyst. In particular, the H2O adsorption coefficient adopted for the commercial catalysts is about two orders of magnitude higher than for the laboratory-made catalyst, and this is in line with the expectations, considering that the commercial catalysts have Ca and K added, which may promote water adsorption.

Fabrication of Ce-Promoted Ni/Al2O3 Methane Steam Reforming Catalysts by Impregnation

2020 ◽  
Vol 20 (7) ◽  
pp. 4327-4330
Author(s):  
Ye Sol Lim ◽  
Min-Jin Lee ◽  
Kyoung-Jin Lee ◽  
Sangjin Lee ◽  
Haejin Hwang
Keyword(s):  
Particle Size ◽  
Microstructural Evolution ◽  
Steam Reforming ◽  
Carbon Deposition ◽  
Methane Steam Reforming ◽  
Ni Catalysts ◽  
Good Dispersion ◽  
Methane Steam ◽  
Reforming Catalysts ◽  
Steam Reforming Catalysts

CeO2-promoted Ni/Al2O3 catalysts were fabricated by impregnation. The effects of the CeO2 promotion and impregnation order on the microstructural evolution and catalytic durability were investigated for methane steam reforming. The CeO2-promoter nanoparticles resulted in good dispersion and reduced particle size of Ni catalysts. The enhanced durability of CeO2-promoted Ni/Al2O3 catalysts might be associated with the depression of carbon deposition by the presence of CeO2-promoter nanoparticles.

scholarly journals In silicosearch for novel methane steam reforming catalysts

2013 ◽  
Vol 15 (12) ◽  
pp. 125021 ◽  
Author(s):  
Yue Xu ◽  
Adam C Lausche ◽  
Shengguang Wang ◽  
Tuhin S Khan ◽  
Frank Abild-Pedersen ◽  
...  
Keyword(s):  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Methane Steam ◽  
Reforming Catalysts ◽  
Steam Reforming Catalysts

scholarly journals A High-Fidelity CFD Model of Methane Steam Reforming in a Packed Bed Reactor

2009 ◽  
Vol 42 (Supplement.) ◽  
pp. s73-s78 ◽  
Author(s):  
Mayu Kuroki ◽  
Shinichi Ookawara ◽  
Kohei Ogawa
Keyword(s):  
Steam Reforming ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Methane Steam Reforming ◽  
High Fidelity ◽  
Cfd Model ◽  
Methane Steam

scholarly journals Sensitivity analysis and optimization of a membrane reactor for hydrogen production through methane steam reforming

2020 ◽  
Vol 5 (6) ◽  
Author(s):  
Igor Nardi Caxiano ◽  
Lizandro De Sousa Santos ◽  
Diego Martinez Prata
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Membrane Reactor ◽  
Packed Bed ◽  
Operating Conditions ◽  
Methane Steam Reforming ◽  
Maximum Efficiency ◽  
Promising Alternative ◽  
Methane Steam

Hydrogen is one of most studied sources for clean power generation in the near future. Nowadays, hydrogen is mainly produced through methane steam reforming in packed bed reactors, with a promising alternative to this technology being the implementation of hydrogen-selective membrane reactors. This work compares the isothermal mathematical models of both designs by assessing the effects of multiple design variables on methane conversion, while also providing recommended operating conditions for maximum efficiency of the membrane reactor over the packed bed technology. Additionally, an optimization study is carried by dividing the reactor length in isothermal segments to achieve higher efficiency. Results showed that the membrane technology considerably increases hydrogen production, with temperature being the most influential variable on methane conversion. While the temperature profile optimization provided similar conversions compared to the isothermal models, the membrane reactor’s efficiency was increased, further justifying its implementation.

scholarly journals Kinetic Study of Nonequilibrium Plasma-Assisted Methane Steam Reforming

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Hongtao Zheng ◽  
Qian Liu
Keyword(s):  
Reaction Mechanism ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Reaction Path ◽  
Nonequilibrium Plasma ◽  
Operating Conditions ◽  
Methane Steam Reforming ◽  
Molar Ratio ◽  
Flux Analysis ◽  
Methane Steam

To develop a detailed reaction mechanism for plasma-assisted methane steam reforming, a comprehensive numerical and experimental study of effect laws on methane conversion and products yield is performed at different steam to methane molar ratio (S/C), residence time s, and reaction temperatures. A CHEMKIN-PRO software with sensitivity analysis module and path flux analysis module was used for simulations. A set of comparisons show that the developed reaction mechanism can accurately predict methane conversion and the trend of products yield in different operating conditions. Using the developed reaction mechanism in plasma-assisted kinetic model, the reaction path flux analysis was carried out. The result shows that CH3recombination is the limiting reaction for CO production and O is the critical species for CO production. Adding 40 wt.% Ni/SiO2in discharge region has significantly promoted the yield of H2, CO, or CO2in dielectric packed bed (DPB) reactor. Plasma catalytic hybrid reforming experiment verifies the reaction path flux analysis tentatively.

Numerical Thermal and Mass Analyses of Autothermal Reformer

2006 ◽  
Author(s):  
Shinku Lee ◽  
Joongmyeon Bae ◽  
Sungkwang Lim
Keyword(s):  
Mass Transfer ◽  
Chemical Reaction ◽  
Steam Reforming ◽  
Operating Conditions ◽  
Local Thermal Equilibrium ◽  
Methane Steam Reforming ◽  
Optimum Operating ◽  
Hydrogen Yield ◽  
Complete Combustion ◽  
High Hydrogen

This paper discusses numerical analysis of heat and mass transfer characteristics in autothermal fuel reformer. Assuming local thermal equilibrium between bulk gas and surface of catalyst, one medium approach for energy equation is incorporated. Also, mass transfer between concentrations of bulk gas and near the surface of catalyst is neglected due to relatively low gas mixture velocity. For surface chemical reaction Langmuir-Hinshelwood reaction is incorporated when methane (CH4) is reformed to hydrogen-rich gases by autothermal reforming (ATR) reaction. Complete combustion, steam reforming, water gas shift and direct methane steam reforming reactions are included in the chemical reaction model. Under two operating conditions (O/C and S/C), ATR reactions are estimated from the numerical calculations. Mass, momentum, and energy equations are simultaneously calculated with chemical reactions. From the predicted results, we can estimate optimum operating conditions for high hydrogen yield.

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