Kinetic-Operational Mechanism to Autothermal Reforming of Methane

Souza, Aleksándros El Áurens Meira de; Maciel, Leonardo José Lins; Cavalcanti-Filho, Valdério O.; Filho, Nelson M. Lima; Abreu, César Augusto Moraes de

doi:10.1021/ie100637b

Cited by 16 publications

(14 citation statements)

References 42 publications

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“…The authors suggested that the proposed kinetic model can be apply in industry to design the process conditions and evaluation of the effect of the inlet gas composition to syngas production including the elimination of the deactivation process and coke deposition on catalytic surface. Souza et al [114] studied the mechanism of the autothermal reforming of methane over nickel based catalysts (ATR). They reported about the high rates of methane conversions at lower temperature compared to the methane reforming processes and that synthesis gas is produced via two steps which includes total oxidation of methane followed by steam reforming of methane and dry reforming of methane.…”

Section: Oxy-steam Reforming Of the Methane Reaction Mechanismmentioning

confidence: 99%

Oxy-Steam Reforming of Natural Gas on Ni Catalysts—A Minireview

2020

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Nowadays, the reforming of natural gas is the most common of hydrogen or syngas generation process. Each reforming process leads to the achievement of specific goals and benefits related to investment costs. The disadvantage of the reforming process is the need to preclean it mostly from the sulfur and nitrogen compounds. The solution to this problem may be liquefied natural gas (LNG). Liquefied natural gas has recently been seen as an energy source and may be a promising replacement for natural gas. The constant development of the pipeline network, safe transport and a lot of advantages of LNG were contributed to the research development related to the usage of LNG in energy generation technologies. The presented review is a literature discussion on the processing of methane used to produce hydrogen with particular emphasis on the processes of oxy-steam reforming of natural or liquefied natural gas (OSR-LNG). In addition, a key consideration in this article includes Ni catalyst systems used in the oxy-steam reforming of methane or LNG reactions. An analysis of the OSR process conditions, the type of catalyst and the OSR of the methane reaction mechanism may contribute to the development of a modern, cheap catalyst system, which is characterized by high activity and stability in the oxy-steam reforming of natural gas or LNG (OSR-LNG).

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Section: Oxy-steam Reforming Of the Methane Reaction Mechanismmentioning

confidence: 99%

Oxy-Steam Reforming of Natural Gas on Ni Catalysts—A Minireview

2020

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“…As illustrated in previous studies for Ni‐based catalysts at similar conditions, methane, CO 2 and intermediates adsorb and react on the same type of active site. The reversibility of methane adsorption and dissociation is supported by the influence of H 2 addition to the feed gas. The methane dissociation generates adsorbed carbon and associated hydrogen atom, which is supposed to be at thermodynamic equilibrium. The adsorption and dissociation of carbon dioxide are considered as reversible (Eq. ) by using 13 CO isotopic tracer techniques .…”

Section: Resultsmentioning

confidence: 99%

“…The reversibility of methane adsorption and dissociation is supported by the influence of H 2 addition to the feed gas. The methane dissociation generates adsorbed carbon and associated hydrogen atom, 31,32 which is supposed to be at thermodynamic equilibrium.…”

Section: Carbon Depositionmentioning

confidence: 99%

Kinetic study of methane reforming with carbon dioxide over NiCeMgAl bimodal pore catalyst

Bao

2016

AIChE Journal

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The kinetic behavior of NiCeMgAl bimodal pore catalyst for methane reforming with CO2 was investigated after the elimination of external and internal diffusion effects in a fixed‐bed reactor as a function of temperature and partial pressures of reactants and products. Increase in CO2 partial pressure favors the consumptions of CH4 and CO2 but inhibits the formation of H2 due to the existence of reverse water gas shift (RWGS) reaction. The reforming rate increased first and then reached a horizontal stage with the rise of CH4 partial pressure. A Langmuir–Hinshelwood model was developed assuming that the carbon deposition is ignorable but the RWGS reaction is non‐ignorable and the removal of adsorbed carbon intermediate is the rate‐determining step. A nonlinear least‐square method was applied to solve the kinetic parameters. The derived kinetic expression fits the experimental data very well with a R2 above 0.97, and also predicts the products flow rate satisfactorily. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2019–2029, 2017

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“…The Gibbs reactor is equal to a 0 D thermodynamic equilibrium calculation based on the Gibbs free energy minimization including not only ideal gases but also condensed species such as solid carbon [50]. The validity of this assumption is shown in several previously published studies [16,47,51]. It should be mentioned here that high gas hourly space velocities (GHSV) can lead to a gas composition at the reformer outlet, which is not close to the chemical equilibrium.…”

Section: Reformer Modellingmentioning

confidence: 99%

Holistic Approach to Design, Test, and Optimize Stand-Alone SOFC-Reformer Systems

et al. 2021

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Reliable electrical and thermal energy supplies are basic requirements for modern societies and their food supply. Stand-alone stationary power generators based on solid oxide fuel cells (SOFC) represent an attractive solution to the problems of providing the energy required in both rural communities and in rurally-based industries such as those of the agricultural industry. The great advantages of SOFC-based systems are high efficiency and high fuel flexibility. A wide range of commercially available fuels can be used with no or low-effort pre-treatment. In this study, a design process for stand-alone system consisting of a reformer unit and an SOFC-based power generator is presented and tested. An adequate agreement between the measured and simulated values for the gas compositions after a reformer unit is observed with a maximum error of 3 vol% (volume percent). Theoretical degradation free operation conditions determined by employing equilibrium calculations are identified to be steam to carbon ratio (H2O/C) higher 0.6 for auto-thermal reformation and H2O/C higher 1 for internal reforming. The produced gas mixtures are used to fuel large planar electrolyte supported cells (ESC). Current densities up to 500 mA/cm2 at 0.75 V are reached under internal reforming conditions without degradation of the cells anode during the more than 500 h long-term test run. More detailed electrochemical analysis of SOFCs fed with different fuel mixtures showed that major losses are caused by gas diffusion processes.

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Kinetic-Operational Mechanism to Autothermal Reforming of Methane

Cited by 16 publications

References 42 publications

Oxy-Steam Reforming of Natural Gas on Ni Catalysts—A Minireview

Oxy-Steam Reforming of Natural Gas on Ni Catalysts—A Minireview

Kinetic study of methane reforming with carbon dioxide over NiCeMgAl bimodal pore catalyst

Holistic Approach to Design, Test, and Optimize Stand-Alone SOFC-Reformer Systems

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