Effect of structural, thermal and flow parameters on steam reforming of methane in a catalytic microreactor

Patil, Ravikant; Patnaik, Amarjeet; Ganguly, Suvankar; Patwardhan, Anand

doi:10.1016/j.cherd.2011.01.009

Cited by 8 publications

(3 citation statements)

References 8 publications

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“…8,9 Generally, for microreactors with catalysts, effective control of the chemical reaction rate is crucial for the reactions 3,10 with desired conversion, 11,12 purity, 13 selectivity, 14 and safety. 7 Usually, the chemical reaction rate in microreactors can be regulated by adjusting certain parameters like concentration, 15 pressure, 16 temperature, 17 and flux. 9 However, all these approaches are passively relying on manual operations; i.e., the current microreactors cannot make an initiative adjustment for reactions responding to the change in environments.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the past few years, continuous-flow microreactors with channel dimensions typically between tens and hundreds of micrometers − have found widespread applications in hazardous reactions, nanosyntheses, pharmaceutical chemistry, etc. − Such microreactors with a high surface-to-volume ratio present exceptionally fast mass and heat transfer − and provide sufficient surface area for on-wall immobilization of catalysts. , Generally, for microreactors with catalysts, effective control of the chemical reaction rate is crucial for the reactions , with desired conversion, , purity, selectivity, and safety . Usually, the chemical reaction rate in microreactors can be regulated by adjusting certain parameters like concentration, pressure, temperature, and flux . However, all these approaches are passively relying on manual operations; i.e., the current microreactors cannot make an initiative adjustment for reactions responding to the change in environments.…”

Section: Introductionmentioning

confidence: 99%

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Novel Smart Microreactors Equipped with Responsive Catalytic Nanoparticles on Microchannels

Zhang

Liu

et al. 2017

ACS Appl. Mater. Interfaces

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Nowadays efficient and reliable control of highly exothermic reactions to effectively prevent overheating or even explosions still remains a challenging task, although newly developed microreactor technology has shown promise. Here, we report a novel smart microreactor system equipped with responsive catalytic nanoparticles on microchannels for self-regulated control over highly exothermic reactions by responding to the reaction-generated heat. On the basis of shrinking/swelling behaviors of polymeric networks in the responsive catalytic nanoparticles, the smart microreactor could respond to the change of reaction temperature to tune the catalysis activity of catalytic particles in a thermo-feedback process. As a breakthrough result, highly exothermic reactions carried out in such a microreactor can be well-controlled in a self-regulation process without any manual assistance, efficiently ensuring the safety of the reaction. Such smart responsive catalytic systems have high potential and are attractive as a new generation of efficient tools that feature a self-regulation property for highly exothermic catalytic reactions.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Smart Microreactors Equipped with Responsive Catalytic Nanoparticles on Microchannels

Zhang

Liu

et al. 2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The process is limited by the low catalyst effectiveness factors, weak heat transport capabilities, and significant initial capital expenditures [5,6]. Microchannel reactors have been investigated as an alternative to tubular reactors for SR of CH 4 [7][8][9][10][11][12] and SR of C 3 H 8 [1,[13][14][15][16]. In microchannel reactors, the active catalyst material is adhered, possibly in a porous layer, to the inner walls of channels.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Methane and Propane Reforming Over a Porous Rh/Al2O3 Catalyst in Stagnation-Flows: Impact of Internal and External Mass Transfer Limitations on Species Profiles

et al. 2020

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Hydrogen production by catalytic partial oxidation and steam reforming of methane and propane towards synthesis gas are numerically investigated in stagnation-flow over a disc coated with a porous Rh/Al2O3 layer. A one-dimensional flow field is coupled with three models for internal diffusion and with a 62-step surface reaction mechanism. Numerical simulations are conducted with the recently developed computer code DETCHEMSTAG. Dusty-Gas model, a reaction-diffusion model and a simple effectiveness factor model, are alternatively used in simulations to study the internal mass transfer inside the 100 µm thick washcoat layer. Numerically predicted species profiles in the external boundary layer agree well with the recently published experimental data. All three models for internal diffusion exhibit strong species concentration gradients in the catalyst layer. In partial oxidation conditions, a thin total oxidation zone occurs close to the gas-washcoat interface, followed by a zone of steam and dry reforming of methane. Increasing the reactor pressure and decreasing the inlet flow velocity increases/decreases the external/internal mass transfer limitations. The comparison of reaction-diffusion and Dusty-Gas model results reveal the insignificance of convective flow on species transport inside the washcoat. Simulations, which additionally solve a heat transport equation, do not show any temperature gradients inside the washcoat.

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A perspective on the past, the present, and the future of computational fluid dynamics (CFD) in flow chemistry

Padoin,

Matiazzo,

Riella

et al. 2024

J Flow Chem

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Effect of structural, thermal and flow parameters on steam reforming of methane in a catalytic microreactor

Cited by 8 publications

References 8 publications

Novel Smart Microreactors Equipped with Responsive Catalytic Nanoparticles on Microchannels

Novel Smart Microreactors Equipped with Responsive Catalytic Nanoparticles on Microchannels

Numerical Simulation of Methane and Propane Reforming Over a Porous Rh/Al2O3 Catalyst in Stagnation-Flows: Impact of Internal and External Mass Transfer Limitations on Species Profiles

A perspective on the past, the present, and the future of computational fluid dynamics (CFD) in flow chemistry

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