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Mechanistic Kinetic Models For Steam Reforming Of Concentrated Crude Ethanol On NI/AL2O3 Catalyst

OLAFADEHAN, O. A. and Ayoola, A. A. and AKINTUNDE, O. O. and ADENIYI, V. O (2015) Mechanistic Kinetic Models For Steam Reforming Of Concentrated Crude Ethanol On NI/AL2O3 Catalyst. Journal of Engineering Science and Technology, 10 (5). 633- 653.

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Abstract

Mechanistic kinetic models were postulated for the catalytic steam reforming of concentrated crude ethanol on a Ni-based commercial catalyst at atmosphere pressure in the temperature range of 673-863 K, and at different catalyst weight to the crude ethanol molar flow rate ratio (in the range 0.9645-9.6451 kg catalyst h/kg mole crude ethanol) in a stainless steel packed bed tubular microreactor. The models were based on Langmuir-Hinshelwood-Hougen-Watson (LHHW) and Eley-Rideal (ER) mechanisms. The optimization routine of Nelder-Mead simplex algorithm was used to estimate the inherent kinetic parameters in the proposed models. The selection of the best kinetic model amongst the rival kinetic models was based on physicochemical, statistical and thermodynamic scrutinies. The rate determining step for the steam reforming of concentrated crude ethanol on Ni/Al2O3 catalyst was found to be surface reaction between chemisorbed CH3O and O when hydrogen and oxygen were adsorbed as monomolecular species on the catalyst surface. Excellent agreement was obtained between the experimental rate of reaction and conversion of crude ethanol, and the simulated results, with ADD% being ±0.46

Item Type: Article
Uncontrolled Keywords: Crude ethanol, Steam reforming, Mechanism, Kinetic model, Optimization, Rate-determining step.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 10 Mar 2016 10:10
Last Modified: 10 Mar 2016 10:10
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/6436

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