Numerical analysis on autothermal steam methane reforming: Effects of catalysts arrangement and metal foam insertion

Chérif, Ali; Nebbali, Rachid

doi:10.1016/j.ijhydene.2018.12.203

Cited by 28 publications

(12 citation statements)

References 36 publications

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“…Thus, a good agreement is observed between the methane conversion according to the numerical results of the present work and those of Zhang et al 69 The error between the methane conversion profiles as a function of the inlet pressure and temperature does not exceed 2.53% and 7.10%, respectively. This verification was used in previously reported works 25,26 …”

Section: Resultsmentioning

confidence: 99%

“…Methane is considered to be a practical raw material for hydrogen production due to its high hydrogen molar fraction and great abundance, with a yearly global production of 1 189 000 Nm 3 16 . Thus, various techniques have been developed for this purpose for example, steam methane reforming (SMR), dry methane reforming (DR), and partial oxidation (POX) 17‐26 . SMR reaction is the commonly used method for the efficient and simple production of hydrogen 27‐29 .…”

Section: Introductionmentioning

confidence: 99%

“…However, the efficiency of the combined process is lower compared with the basic SMR method, and an abrupt variation of temperature can be detrimental to the used materials 39‐42 . To address this latter issue, Cherif et al 25 numerically analyzed the combined effects of the catalytic layer arrangement method and copper foam insertion for the ATR reaction over Ni and Pt coated catalysts. The results indicated a slight improvement in the hydrogen yield along with a significant decrease in temperature of about 45% with smooth profile, which can potentially broaden the choice of materials for the process, prevent the undesired side reactions and extend the life of the reactor.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

2021

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Summary Herein, a 2D numerical analysis is conducted to study the steam methane reforming reaction (SMR), which is the dominant method for hydrogen production, over a packed bed reactor embedded with a Ni/Al2O3 catalyst. Aiming to achieve higher methane conversion and low catalyst weight, a comparative study on an SMR reactor consisting of a 1‐m long, 0.04‐m diameter cylinder, is examined under three distinct operative configurations to explore new routes for process intensification. In the first configuration, the SMR reactor is filled with the catalyst in accordance with the conventional approach. In case 2, a novel design is proposed where the reactor is partially filled with annular catalyst bed patterns while in the last case, the length of the reactor is extended by 35.4% to obtain the same catalyst weight as in case 1 while adopting the annular catalyst patterns concept. The advantages of implementing the catalyst patterns concept over the conventional reactor are illustrated and justified. The results indicate that the partially filled reactor improves the methane conversion by 10.6% by reducing the catalyst weight by 26.16% compared to the conventional reactor. This latter leads to a lower overall cost of the reactor. Extending the reactor increases the methane conversion by around 23% compared to the conventional reactor; however, this affects the reactor compactness.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

2021

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“…Thus, the membrane helps to decentralize the system by reducing the number of separation modules and affords fast response times. Similarly, the autothermal reforming (ATR) of steam and methane helps in reducing the heating modules 13‐18 . Both membrane and ATR concepts can be incorporated into the same reactor configuration for further decentralization 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Design and multiobjective optimization of membrane steam methane reformer: A computational fluid dynamic analysis

Chérif

Nebbali

Lee

2022

Intl J of Energy Research

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Summary A membrane reactor affords promising advantages for processes; however, it faces many issues such as the high cost, manufacturing complexity, and ineffective zones. In this numerical analysis, we propose a design and multiobjective optimization of membrane steam methane reforming reactor to attain an effective arrangement for high hydrogen yield and separation. Four configurations were investigated for comparative analysis, adopting continuous and segmented catalyst and membrane arrangements; thereafter, the genetic algorithm optimization approach was applied. The advantages of the proposed membrane and catalyst design were shown and justified. Compared to the conventional case, the results showed high hydrogen yield and separation in the design case, despite the significant reduction in the Pd membrane length. For the optimal case, further improvement of the hydrogen separation and high hydrogen yield were achieved with 20% less catalyst load and an 80% reduction in the membrane length as the membrane was effectively embedded, which can significantly reduce the cost of the process. Furthermore, the complexity of the membrane reactor was avoided as the reaction and the separation were conducted separately.

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“…Different transient metals can be used as catalysts in the steam methane reforming, the more common used metals are the ruthenium (Ru), palladium (Pb), rhodium (Rh), radium (Rd), nickel (Ni) and platinum (Pt). In our previous research, an achievement of 45% of temperature reduction [8] for the autothermal reformers which can enlarge the used materials and extend the lifetime of the reactor. In this study, the influence of the variation in catalytic loading by changing the size of the two catalysts of an autothermal steam methane reformer was investigated, once the nickel catalyst thickness was determined and changing the size of the platinum catalyst.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Ni/Al2O3 and Pt/Al2O3 Catalysts Load in Autothermal Steam Methane Reforming

Chérif

Nebbali

Nasseri

2020

Springer Proceedings in Energy

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In this paper we analyzed an autothermal reformer for the hydrogen production from methane and vapor. The endothermic reforming reaction was heated with the exothermic reaction of methane combustion inside a rectangular reactor. The reforming reaction was activated with nickel (Ni) catalyst layer that coated on one wall of the reactor, while the second wall was coated with platinum (Pt) catalyst in order to activate the combustion reaction. The quantity of the catalysts used for each reaction has an important effect on the process. A low quantity of the catalysts can decrease the hydrogen yield, on the other hand, additional quantity can increase reactor conception costs. So that, the optimization of the process to find out an adequate quantity of catalysts is required to improve the process [1]. The Ni catalyst thickness was varied from 1 × 10 −4 m to 4 × 10 −4 m while the variation of the Pt catalyst was between 5 × 10 −6 m and 4 × 10 −5 m. The results showed that the hydrogen yield achieved an optimum value of 36.295% was obtained when the catalyst was operated under a catalyst thickness of 2 × 10 −4 m for the Ni catalyst, while, the thickness of the Pt catalyst was of 2 × 10 −5 m. the maximum temperature.

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Numerical analysis on autothermal steam methane reforming: Effects of catalysts arrangement and metal foam insertion

Cited by 28 publications

References 36 publications

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

Design and multiobjective optimization of membrane steam methane reformer: A computational fluid dynamic analysis

Optimization of the Ni/Al2O3 and Pt/Al2O3 Catalysts Load in Autothermal Steam Methane Reforming

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Numerical analysis on autothermal steam methane reforming: Effects of catalysts arrangement and metal foam insertion

Cited by 28 publications

References 36 publications

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al 2 O 3 catalyst pattern

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al 2 O 3 catalyst pattern

Design and multiobjective optimization of membrane steam methane reformer: A computational fluid dynamic analysis

Optimization of the Ni/Al2O3 and Pt/Al2O3 Catalysts Load in Autothermal Steam Methane Reforming

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Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern

Numerical analysis of steam methane reforming over a novel multi‐concentric rings Ni/ Al ₂ O ₃ catalyst pattern