Comparison of membrane and conventional reactors under dry methane reforming conditions

Alexandrov, A.; Гаврилова, Н.Н.; Kislov, V.R.; Скудин, В. В.

doi:10.1134/s0965544117090031

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…The rate constants (extrapolated at contact time = 0) of reaction (R2) in both modes of the membrane reactor are close at all temperatures and significantly exceed the constants on a traditional catalyst. The activation energy (Table 1) in a traditional reactor is higher than in the membrane type, and its value corresponds to the values that we observed earlier [18,32] on such catalysts. The E a values for the membrane catalyst, although different, are insignificant.…”

Section: Kinetic Experiments and Analysis Of Methane Carbon Dioxide C...supporting

confidence: 83%

Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

et al. 2022

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This article presents an analysis of kinetic studies of dry methane reforming (DRM) in a reactor with a membrane catalyst (RMC) in the modes of a contactor with “diffusion” and “forced” mass transfer. Comparison of the specific rate constants of the methane dissociation reaction in membrane and traditional reactors confirmed the phenomenon of intensification of dry methane reforming in a membrane catalyst (MC). It has been experimentally established that during DRM, a temperature gradient arises in the channels of the pore structure of the membrane catalyst, characterized by a decrease in temperature towards the inner volume of the MC, and initiates the phenomenon of thermal slip. The features of this phenomenon are highlighted and must be considered in the analysis of kinetic data. The main provisions of the hypothesis explaining the effect of intensification by the occurrence of thermal slip in the channels of the pore structure of the MC are formulated. The proposed hypothesis, based on thermal slip, explains the difference in rate constants of traditional and membrane catalysts, and substantiates the phenomenological scheme of DRM stages in a reactor with a membrane catalyst.

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Section: Kinetic Experiments and Analysis Of Methane Carbon Dioxide C...supporting

confidence: 83%

Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

et al. 2022

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“…The DRM reaction (Equation (7)) can be considered as a parallel-sequential set of a number of stages [ 10 , 16 ]:

…”

Section: Resultsmentioning

confidence: 99%

Transport Reagents through the Pore Structure of a Membrane Catalyst under Isothermal and Non-Isothermal Conditions

et al. 2021

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The article presents the results of an experimental comparison of methane transport in the pore structure of a membrane catalyst under isothermal and non-isothermal Knudsen diffusion conditions. It is shown that under the conditions of non-isothermal Knudsen diffusion in the pore structure of the membrane catalyst, there is a coupling of dry reforming of the methane (DRM) and gas transport, which leads to the intensification of this process. The reasons for the intensification are changes in the mechanism of gas transport, an increase in the rate of mass transfer, and changes in the mechanism of some stages of the DRM. The specific rate constant of the methane dissociation reaction on a membrane catalyst turned out to be an order of magnitude (40 times) higher than this value on a traditional (powder) catalyst.

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“…Various types of reactors are used for thermocatalytic reactions such as dry reforming (DR). The most conventional ones are: fixed bed [1][2][3], fluidized bed (FBR) [4][5][6], rotary [7][8][9] and membrane reactors [10][11][12]. Fixed bed reactors have several problems, and their use remains limited on a laboratory scale because it is easier at this scale to provide a high energy supply in order to overcome the endothermicity of DR reaction.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, this type of configuration makes it easy to add and remove catalyst, allowing for easier process scale-up [14][15][16][17]. There are also membrane reactors which have been extensively studied in the literature and applied to reforming processes of hydrocarbons and oxygenated hydrocarbons [10,[18][19][20][21]. The interest of this type of reactor consists in the selective separation of the hydrogen from the products in order to push the balance in the direction of the products and, thus, increase the yields.…”

Section: Introductionmentioning

confidence: 99%

Production of hydrogen and carbon nanofilaments using a novel reactor configuration: hydrodynamic study and experimental results

Azara¹,

Blanchard²,

Mohellebi³

et al. 2022

ENPESJ

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A novel reactor configuration combining two beds, a central fluidized bed and an annular mobile bed, was designed for the production of hydrogen and carbon nanofilaments via dry reforming of gases produced from the pyrolysis of plastic waste. This combination allows for easy recovery of these nanomaterials and, since the mixture of catalyst and carbon formed is continuously fluidized, it also prevents blockage. Understanding the hydrodynamics is crucial for choosing the optimal operating conditions. Thus, a cold mock-up unit of the same size has been built and used. Since the gases produced by plastic pyrolysis are mainly composed of unsaturated hydrocarbons, the prototype reactor setup has been operated using ethylene as a surrogate molecule. The preliminary experimental results of the reactor operation with ethylene obtained so far are very promising and confirm the operability of the process. Next step is to operate continuously for longer time and reach a production of 1kg/h of carbon nanofilaments.

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Comparison of membrane and conventional reactors under dry methane reforming conditions

Cited by 5 publications

References 15 publications

Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

Intensification of Dry Reforming of Methane on Membrane Catalyst: Confirmation and Development of the Hypothesis

Transport Reagents through the Pore Structure of a Membrane Catalyst under Isothermal and Non-Isothermal Conditions

Production of hydrogen and carbon nanofilaments using a novel reactor configuration: hydrodynamic study and experimental results

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