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.

Transport Mechanism of Methane Steam Reforming on Fixed Bed Catalyst Heated by High Temperature Helium for Hydrogen Production: A CFD Investigation

2017 ◽  
Author(s):  
Feng Wang ◽  
Jing Zhou ◽  
Qiang Wen
Keyword(s):  
High Temperature ◽  
Hydrogen Production ◽  
Production Rate ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Methane Steam Reforming ◽  
Inlet Temperature ◽  
Hydrogen Production Rate ◽  
Inlet Velocity ◽  
Methane Steam

Performance of methane steam reforming reactor heated by helium for hydrogen production has been studied by numerical method. Results show with the increasing of reactant gas inlet velocity, temperature in the reactor drops, leading to the decreasing of methane conversion and hydrogen production rate. Methane conversion, hydrogen production and hydrogen production rate rise with the increasing of reactant gas inlet temperature, while the increasing degree of system thermal efficiency reduces. Besides, with helium inlet velocity rising, temperature in the reactor increases and reaction in the reactor becomes more sufficient. Therefore, methane conversion and hydrogen production also increase when helium inlet temperature of rises, but its influence is weaker compared to that of helium inlet velocity. In the process of methane steam reforming heated by high temperature gas cooled reactor (HTGR) for hydrogen production, lower reactant gas inlet velocity, suitable inlet temperature, higher inlet velocity and higher HTGR outlet temperature of helium are preferable.

Hydrogen Production by Methane Steam Reforming Over Ru and Cu Supported on Hydrotalcite Precursors

2011 ◽  
Vol 324 ◽  
pp. 453-456 ◽  
Author(s):  
Doris Homsi ◽  
Samer Aouad ◽  
Cedric Gennequin ◽  
Antoine Aboukaïs ◽  
Edmond Abi-Aad
Keyword(s):  
Hydrogen Production ◽  
Cobalt Oxide ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Nitrate Solution ◽  
Methane Steam Reforming ◽  
Cobalt Oxides ◽  
X Ray Diffraction ◽  
X Ray ◽  
Methane Steam

Co6Al2oxide was prepared using the hydrotalcite route. The obtained solid was thermally stabilized at 500°C and then impregnated with 5 wt.% copper or 1 wt.% ruthenium nitrate solution followed by calcination at 500°C under an air flow. X-ray diffraction results showed that the calcination of the impregnated solids led to the formation of various oxides (CuO, RuO2, Co3O4, CoAl2O4, CoAl2O4). The different impregnated and non impregnated solids were tested in the methane steam reforming reaction (MSR). Methane conversion did not exceed 5% at 800°C in the case of the non impregnated solid, whereas the impregnation strongly enhanced the reactivity: ~89% and ~92% conversions were reached at 600°C for Cu and Ru respectively. The good reactivity of ruthenium impregnated catalyst was attributed to the formation of easily reducible ruthenium and cobalt oxide species at the surface of the support. The addition of ruthenium made the reduction of surface and bulk cobalt oxides possible at lower temperatures.

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