On the non-monotonic behaviour of methane—steam reforming kinetics

Elnashaie, S.S.E.H.; Adris, A.M.; Al-Ubaid, A.S.; Soliman, M.A.

doi:10.1016/0009-2509(90)87036-r

Cited by 95 publications

(65 citation statements)

References 11 publications

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“…A considerable amount of work on the kinetic aspects of the SMR process has been carried out since 1970; see, for example, Schnell (1970), Ross and Steel (1973), Allen (1975), Phung Quach and Rouleau (1975), Munsted andGrabke (1981), De Deken, Deves andFroment (1982), and Xu and Froment (1989a, b). To date, the rate models proposed by Xu and Froment (1989a) are considered to be the most general in form, and have been extensively tested under typical industrial operating conditions (see, also, Elnashaie, Adris, Al-Ubaid & Soliman, 1990). However, like most previous work, the models are applicable to steady-state kinetics, and untested for forced-dynamic operation.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-enhanced steam–methane reforming

Ding

Alpay

2000

Chemical Engineering Science

282

169

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Section: Introductionmentioning

confidence: 99%

Adsorption-enhanced steam–methane reforming

Ding

Alpay

2000

Chemical Engineering Science

282

169

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“…4,20,29 This generic kinetic framework is being widely used in modeling industrial reformers till today. Later, Elnashaie et al 30 carried out parametric study of this model over a wide range of parameters and showed a nonmonotonic dependence of the reaction rate on the steam partial pressure. This gave rise to an interesting optimization problem with feed partial pressure of steam as the decision variable.…”

Section: Modeling Of Smrmentioning

confidence: 97%

Process intensification aspects for steam methane reforming: An overview

2009

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Steam methane reforming (SMR) is the most widely used process in industry for the production of hydrogen, which is considered as the future generation energy carrier. Having been perceived as an important source of H2, there are abundant incentives for design and development of SMR processes mainly through the consideration of process intensification and multiscale modeling; two areas which are considered as the main focus of the future generation chemical engineering to meet the global energy challenges. This article presents a comprehensive overview of the process integration aspects for SMR, especially the potential for multiscale modeling in this area. The intensification for SMR is achieved by coupling with adsorption and membrane separation technologies, etc., and using the concept of multifunctional reactors and catalysts to overcome the mass transfer, heat transfer, and thermodynamic limitations. In this article, the focus of existing and future research on these emerging areas has been drawn. © 2009 American Institute of Chemical Engineers AIChE J, 2009

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“…However, in a conventional steam methane reformer, a steam to carbon ration of 2.8 is most commonly used. A study by Elnashaie et al 19 showed that the general rate equation based on Langmuir-Hinshelwood-Hougen-Watson approach, developed by Xu and Froment 20 for a 15.2% Ni/MgAl 2 O 3 catalyst, describes most accurately the process for a wide range of parameters. Consequently, this kinetics is used in this work to describe the steam reforming process.…”

Section: Description Of the Reaction Systemmentioning

confidence: 99%

Optimizing the catalyst distribution for countercurrent methane steam reforming in plate reactors

Zanfir¹,

Bâldea²,

Daoutidis

2010

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Microscale autothermal reactors remain one of the most promising technologies for efficient hydrogen generation. The typical reactor design alternates microchannels where reforming and catalytic combustion of methane occur, so that exothermic and endothermic reactions take place in close proximity. The influence of flow arrangement on the autothermal coupling of methane steam reforming and methane catalytic combustion in catalytic plate reactors is investigated. The reactor thermal behavior and performance for cocurrent and countercurrent are simulated and compared. A partial overlapping of the catalyst zones in adjacent exothermic and endothermic channels is shown to avoid both severe temperature excursions and reactor extinction. Using an innovative, optimization-based approach for determining the catalyst zone overlap, a solution is provided to the problem of determining the maximum reactor conversion within specified temperature bounds, designed to preserve reactor integrity and operational safety.

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On the non-monotonic behaviour of methane—steam reforming kinetics

Cited by 95 publications

References 11 publications

Adsorption-enhanced steam–methane reforming

Adsorption-enhanced steam–methane reforming

Process intensification aspects for steam methane reforming: An overview

Optimizing the catalyst distribution for countercurrent methane steam reforming in plate reactors

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