Kinetic modeling of hydrogen production by the catalytic reforming of crude ethanol over a co-precipitated Ni-Al2O3Ni-Al2O3 catalyst in a packed bed tubular reactor

Akande, Abayomi; Aboudheir, Ahmed; Idem, Raphael; Dalai, Ajay K.

doi:10.1016/j.ijhydene.2006.01.001

Cited by 106 publications

(90 citation statements)

References 17 publications

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“…This kind of analysis is used in [37][38][39], where catalysts of Ru/Al2O3, Ni/MgO/Al2O and Ni/Al2O3 yielded the following kinetic parameters (Table 9). Notice very small values of the activation energy, which may indicate the presence of diffusional limitations or of highly correlated parameters.…”

Section: = −mentioning

confidence: 99%

“…Table 4 of ref. [39]. The values for and from ref [37] (not reported in the same form, but as calculated constants at different temperatures) have been fitted with Excel™ REGRLIN (r 2 = 0.9446), while the power-law model of ref.…”

Section: = −mentioning

confidence: 99%

“…This approach was followed by Akande et al [39], who further divided the ethanol splitting reaction into two steps (ethanol adsorption and the actual C-C break) and lumped methanation and WGS reactions into one stoichiometry but allowing for two different paths: Barring the detail, and noticing that this work does not account for CO in the mixture or on the catalyst (Ni/Al2O3), we point out that even this simple analysis yielded comparable activation energies and mean square errors (MSE, we mean calculated concentrations versus measured ones, for the best extrapolated values of the kinetic parameters) when the RDS was considered the 2 nd or the 3 rd , confirming on a purely kinetic ground that the methanation and WGS reactions may be not faster than the C-C break and sensitive to the mechanism being actually followed. Table 4 of ref.…”

Section: -Esr: From Stoichiometry To Mechanismmentioning

confidence: 99%

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Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

Tripodi¹,

Compagnoni²,

Martinazzo³

et al. 2017

Preprint

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Process simulation represents an important tool for plant design and optimisation, either applied to well established or to newly developed processes. Suitable thermodynamic packages should be selected in order to properly describe the behaviour of reactors and unit operations and to precisely define phase equilibria. Moreover, a detailed and representative kinetic scheme should be available to predict correctly the dependence of the process on its main variables. This review points out some models and methods for kinetic analysis specifically applied to the simulation of catalytic processes, as a basis for process design and optimisation. Attention is paid also to microkinetic modelling and to the methods based on first principles, to elucidate mechanisms and calculate thermodynamic and kinetic parameters. Different case histories support the discussion. At first, we have selected two basic examples from the industrial chemistry practice, e.g. ammonia and methanol synthesis, which may be described through a relatively simple reaction pathway. Then, a more complex reaction network is deeply discussed to define the conversion of bioethanol into syngas/hydrogen or into building blocks, such as ethylene.

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Section: = −mentioning

confidence: 99%

Section: = −mentioning

confidence: 99%

Section: -Esr: From Stoichiometry To Mechanismmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

Tripodi¹,

Compagnoni²,

Martinazzo³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…However, the knowledge accumulated during the systematic explorations of the kinetic mechanisms occurring during MSR provides a valuable starting point for ESR researchers to expand upon. In recent years, based on the observations obtained from both gas phase and sample surface, several kinetic models have been proposed to simulate the mechanistic behaviors of various catalyst systems [128][129][130][131][132], which will facilitate better understanding of the reaction mechanisms. If the estimated values are in good consistency with the reported experimental results, the assumed reaction pathways and ratedetermining step (RDS) will uncover the actual reaction mechanisms to a certain level.…”

Section: Reaction Mechanism and Kinetic Studiesmentioning

confidence: 99%

“…According to related publications, several researchers have conducted such study to evaluate the impact of impurities on catalytic performance toward hydrogen production. A. Akande and his coworkers investigated the influence of crude ethanol simulated through adding small amount of lactic acid, glycerol, and maltose to ethanol aqueous solution on the catalytic performance of Ni/Al 2 O 3 [128,167]. Initial catalyst deactivation was observed followed by stable run within 12 hours test.…”

Section: Future Development Directionsmentioning

confidence: 99%

Catalytic Hydrogen Production from Bioethanol

Song

2017

Hydrogen Production Technologies

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Steam reforming of ethanol over skeletal Ni‐based catalysts: A temperature programmed desorption and kinetic study

Zhang

et al. 2013

AIChE Journal

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An investigation on reaction scheme and kinetics for ethanol steam reforming on skeletal nickel catalysts is described. Catalytic activity of skeletal nickel catalyst for low-temperature steam reforming has been studied in detail, and the reasons for its high reactivity for H 2 production are attained by probe reactions. Higher activity of water gas shift reaction and methanation contributes to the low CO selectivity. Cu and Pt addition can promote WGSR and suppress methanation, and, thus, improve H 2 production. A reaction scheme on skeletal nickel catalyst has been proposed through temperature programmed reaction spectroscopy experiments. An Eley-Rideal model is put forward for kinetic studies, which contains three surface reactions: ethanol decomposition, water gas shift reaction, and methane steam reforming reaction. The kinetics was studied at 300-400 C using a randomized algorithms method and a least-squares method to solve the differential equations and fit the experimental data; the goodness of fit obtained with this model is above 0.95. The activation energies for the ethanol decomposition, methane steam reforming, and water gas shift reaction are 187.7 kJ/ mol, 138.5 kJ/mol and 52.8 kJ/mol, respectively. Thus, ethanol decomposition was determined to be the rate determining reaction of ethanol steam reforming on skeletal nickel catalysts. V C 2013 American Institute of Chemical Engineers AIChE J, 60: [635][636][637][638][639][640][641][642][643][644] 2014

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Kinetic modeling of hydrogen production by the catalytic reforming of crude ethanol over a co-precipitated Ni-Al2O3Ni-Al2O3 catalyst in a packed bed tubular reactor

Cited by 106 publications

References 17 publications

Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

Catalytic Hydrogen Production from Bioethanol

Steam reforming of ethanol over skeletal Ni‐based catalysts: A temperature programmed desorption and kinetic study

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