Effects of microreactor wall heat conduction on the reforming process of methane

Stutz, Michael J.; Poulikakos, Dimos

doi:10.1016/j.ces.2005.06.012

Cited by 57 publications

(23 citation statements)

References 10 publications

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“…These findings are in accordance with those of similar studies in the literature stating that the maximum and average temperatures of reaction channel will be higher when using materials with low conductivity. [22][23][24] Apart from temperature, distance of the locus of peak temperature from the entrance of the reaction channel is found to increase with thermal conductivity. This is due to the fact that the reaction mixture is forced to transfer its heat to steam before reactions move forward and release more heat.…”

Section: Resultsmentioning

confidence: 92%

“…These observations are similar to the studies involving different wall separated endothermic-exothermic flow couplings which report that the amount of heat transfer through the wall increases with wall thickness. [22][23][24] In addition to its thickness, type of wall material is investigated in terms of its impact on the reaction temperature. For this purpose, use of four different materials-alumina, AISI steel, aluminum, and copper-having different thermal conductivities listed in Table 5 are simulated.…”

Section: Resultsmentioning

confidence: 99%

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Parametric analysis of Fischer‐tropsch synthesis in a catalytic microchannel reactor

Gumuslu

Avcı

2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Fischer-Tropsch synthesis (FTS) involves highly exothermic conversion of syngas to a wide range of hydrocarbons, but demands isothermal conditions due to the strong dependence of product distribution on temperature. Running FTS in microchannel reactors is promising, as the sub-millimeter dimensions can lead to significant intensification that inherently favors robust temperature control. This study involves computerbased FTS simulations in a heat-exchange integrated microchannel network composed of horizontal groups of square-shaped cooling and wall-coated, catalytic reaction channels. Effects of material type and thickness of the wall separating the channels, side length of the cooling channel, coolant flow rate, and channel wall texture on reaction temperature are investigated. Use of thicker walls with high thermal conductivities and micro-baffles on the catalytic reaction channel wall favor near-isothermal conditions. Response of reaction temperature against coolant flow rate is significant. Using cooling channels with smaller side lengths, however, is shown to be insufficient for temperature control.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Parametric analysis of Fischer‐tropsch synthesis in a catalytic microchannel reactor

Gumuslu

Avcı

2011

AIChE Journal

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“…Despite similarities, thermodynamic equilibrium calculations only serve as reference for our system, since they do not take into consideration catalytic activities like fuel conversion and other complex aspects of reactant behavior along the reaction path. For example, different reaction pathways towards hydrogen generation run simultaneously in different regions inside the reactor [33,34]. To this end, at reactor inlet, partial oxidation competes primarily with total oxidation reaction.…”

Section: Fig 5 Gas Analysis Results For Propane For Different Fuel mentioning

confidence: 99%

A nanoparticle bed micro-reactor with high syngas yield for moderate temperature micro-scale SOFC power plants

Santis-Alvarez

Nabavi

Jiang

et al. 2012

Chemical Engineering Science

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This work introduces and investigates the a novel compact catalytic nanoparticle bed microfabricated reactor suitable for utilization in small-scale intermediate-temperature micro-SOFC systems. It is shown that the presented micro-reactor is able to produce syngas (CO + H 2 ) efficiently from n-butane and propane at temperatures between 550 -620 °C by means of catalytic partial oxidation (CPOX) using Rh-doped nanoparticles embedded in a foam-like porous ceramic bed as a catalyst. The novel micro-fabricated reactor system is experimentally tested using a carrier specially designed for heating the reactor as well as feeding the fuel and receiving the reaction product gases. Optimization of the syngas production is performed by varying fuel dilutions and reactor temperatures. The performance of the micro-reactor was investigated in two modes: (1) Continuous heating mode, in which two built-in heaters underneath the carrier are kept on throughout the reforming reaction. This simulates the operating state of a micro-SOFC system where the post-combustor provides heat to the microreformer continuously. (2) Thermally self-sustained mode, in which the heaters are turned off after the CPOX has been ignited. An estimation of the heat losses of both testing modes is also given. The present micro-reactor is able to achieve syngas yield as high as 60 % for nbutane and 50 % for propane in the continuous heating mode, which is a substantial improvement to state-of-the-art micro-reactors.

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“…114 Wall conduction is also an important parameter and hydrogen yield is observed to be the highest for no or very low conductive walls. 123 Stutz et al 124 numerically investigated the effect of catalyst surface site density and reactor geometry on the performance of a single-channel microreactor. An important conclusion derived from their study was that hydrogen selectivity is dependent on the catalyst loading which is an important degree of freedom to maximize H 2 productivity.…”

Section: Other Efforts In Novel Reactor Designmentioning

confidence: 99%

Process intensification aspects for steam methane reforming: An overview

2009

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Steam methane reforming (SMR) is the most widely used process in industry for the production of hydrogen, which is considered as the future generation energy carrier. Having been perceived as an important source of H2, there are abundant incentives for design and development of SMR processes mainly through the consideration of process intensification and multiscale modeling; two areas which are considered as the main focus of the future generation chemical engineering to meet the global energy challenges. This article presents a comprehensive overview of the process integration aspects for SMR, especially the potential for multiscale modeling in this area. The intensification for SMR is achieved by coupling with adsorption and membrane separation technologies, etc., and using the concept of multifunctional reactors and catalysts to overcome the mass transfer, heat transfer, and thermodynamic limitations. In this article, the focus of existing and future research on these emerging areas has been drawn. © 2009 American Institute of Chemical Engineers AIChE J, 2009

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Effects of microreactor wall heat conduction on the reforming process of methane

Cited by 57 publications

References 10 publications

Parametric analysis of Fischer‐tropsch synthesis in a catalytic microchannel reactor

Parametric analysis of Fischer‐tropsch synthesis in a catalytic microchannel reactor

A nanoparticle bed micro-reactor with high syngas yield for moderate temperature micro-scale SOFC power plants

Process intensification aspects for steam methane reforming: An overview

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