Kinetic modeling of steam reforming of ethanol for the production of hydrogen over Co/Al2O3 catalyst

Sahoo, Dipti Ranjan; Vajpai, Shilpi; Patel, Sanjay; Pant, Kamal K.

doi:10.1016/j.cej.2006.08.011

Cited by 191 publications

(148 citation statements)

References 27 publications

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“…The same authors substantially refined the first proposed kinetic model in a later work [53], based on an extensive data collection obtained by tests on a catalysts of Ni/alumina and Ni(II)/Al(III), taking advantage of the mechanism selection already worked out by Graschinsky et al [54] (data from a Rh/magnesia/alumina catalyst) and of a similar work by Sahoo et al [55] to explain their own data (Co/alumina). While these papers share the same core of RDS, the latter authors adopt an abridged stoichiometry where the methanation is not treated explicitly, as it were just the 'equilibration link' between "dry reforming" and a full "steam reforming".…”

Section: Rdsmentioning

confidence: 99%

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

et al. 2017

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Abstract:Process simulation represents an important tool for plant design and optimization, either applied to well established or to newly developed processes. Suitable thermodynamic packages should be selected in order to properly describe the behavior 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 optimization. Attention is paid also to microkinetic modelling and to the methods based on first principles, to elucidate mechanisms and independently calculate thermodynamic and kinetic parameters. Different case studies 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 and the relative available kinetic scheme. 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. In this case, lumped kinetic schemes completely fail the description of process behavior. Thus, in this case, more detailed-e.g., microkinetic-schemes should be available to implement into the simulator. However, the correct definition of all the kinetic data when complex microkinetic mechanisms are used, often leads to unreliable, highly correlated parameters. In such cases, greater effort to independently estimate some relevant kinetic/thermodynamic data through Density Functional Theory (DFT)/ab initio methods may be helpful to improve process description.

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Section: Rdsmentioning

confidence: 99%

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

et al. 2017

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“…The catalyst mixture was loaded into a quartz tube reactor (12 mm ID) with a frit fused equidistant from both ends of the tube. The plug flow reactor condition was achieved by eliminating back mixing and channeling when a ratio of 45 was maintained between the catalyst bed height and catalyst particle size (L/Dp) and a ratio of 60 was maintained between the reactor internal diameter and catalyst particle size (D/Dp) [75,76]. Before the reaction, the catalysts were reduced in 10% H2/N2 (300 mL/min) at 700 °C for 1 h (these samples are the "reduced (R)" catalysts).…”

Section: Catalytic Testsmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

et al. 2015

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CeO2-, ZrO2-, and La2O3-supported Rh-Pt catalysts were tested to assess their ability to catalyze the steam reforming of ethanol (SRE) for H2 production. SRE activity tests were performed using EtOH:H2O:N2 (molar ratio 1:3:51) at a gaseous space velocity of 70,600 h −1 between 400 and 700 °C at atmospheric pressure. The SRE stability of the catalysts was tested at 700 °C for 27 h time on stream under the same conditions. RhPt/CeO2, which showed the best performance in the stability test, also produced the highest H2 yield above 600 °C, followed by RhPt/La2O3 and RhPt/ZrO2. The fresh and aged catalysts were characterized by TEM, XPS, and TGA. The higher H2 selectivity of RhPt/CeO2 was ascribed to the formation of small (~5 nm) and stable particles probably consistent of Rh-Pt alloys with a Pt surface enrichment. Both metals were oxidized and acted as an almost constant active phase during the stability test owing to strong metal-support interactions, as well as the superior oxygen mobility of the support. The TGA results confirmed the absence of carbonaceous residues in all the aged catalysts.

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“…The same authors substantially refined the first proposed kinetic model in a later work [45], based on an extensive data collection obtained by tests on a catalysts of Ni/alumina and Ni(II)/Al(III), taking advantage of the mechanism selection already worked out by Graschinsky et al [46] (data from a Rh/magnesia/alumina catalyst) and of a similar work by Sahoo et al [47] to explain their own data (Co/alumina). While these papers share the same core of RDS, the latter authors adopt an abridged stoichiometry where the methanation is not treated explicitly, as it were just the 'equilibration link' between "dry reforming" and a full "steam reforming".…”

Section: Rdsmentioning

confidence: 99%

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.

show abstract

Kinetic modeling of steam reforming of ethanol for the production of hydrogen over Co/Al2O3 catalyst

Cited by 191 publications

References 27 publications

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

Process Simulation for the Design and Scale Up of Heterogeneous Catalytic Process: Kinetic Modelling Issues

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

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

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