Temperature profiles and residence time effects during catalytic partial oxidation and oxidative steam reforming of propane in metallic microchannel reactors

Aartun, Ingrid; Venvik, Hilde J.; Holmén, Anders; Pfeifer, Peter; Görke, Oliver; Schubert, K. R.

doi:10.1016/j.cattod.2005.09.001

Cited by 72 publications

(29 citation statements)

References 54 publications

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“…The partial oxidation of propane on micro-structured reactors was studied by Aartun et al [22,36,37], where rhodium-alumina catalysts were impregnated on Fecralloy-micro-channeled reactors. Artun et al [37] reported propane conversion values below 40 % and a hydrogen and carbon monoxide volume content in the exhaust gas of < 2 % and < 3 %, respectively, at a reaction temperature of 600°C.…”

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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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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“…In this respect, we would recall that Holmen and co-workers [8,9] gave an important contribution, since they first characterized the axial temperature profiles of honeycomb catalysts in CH 4 -CPO, introducing the use of sliding thermocouples. It was found that, relatively to the temperature profile of an external heating furnace, the temperature profiles along the monolith presented a hot-spot right after the entrance of the reactor, followed by a steep decrease and even a minimum downstream.…”

Section: Introductionmentioning

confidence: 98%

Optimal Design of A CPO-Reformer of Light Hydrocarbons with Honeycomb Catalyst: Effect of Frontal Heat Dispersions on the Temperature Profiles

et al. 2011

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This paper extends a previous investigation on the thermal behavior of CH 4 -CPO reformers with honeycomb catalysts. Modeling and experimental studies on the short contact time catalytic partial oxidation (CPO) of CH 4 to syngas from our and from other groups have shown that Rh-catalysts rapidly deactivate at the very high temperatures, close to 1000°C, that establish in the inlet zone of the reactor. We have previously shown that a significant reduction of the surface hot-spot temperature can be obtained by properly designing the catalyst: beneficial effects are observed at increasing opening of the honeycomb channels, which decreases the rate of O 2 inter-phase mass transfer, and at increasing catalyst activity, which promotes the rate of the endothermic reactions. In this work, we explore the effect of the reactor configuration, namely the effect of heat dispersion from the glowing front face of the monolith. Three reactor configurations were compared in CH 4 -CPO experiments: (i) a configuration with perfect continuity between the front heat shield (FHS) and the catalytic module, which behaved close to an ideal adiabatic reactor, (ii) a configuration where the FHS was separated from the catalytic monolith and (iii) a configuration where the FHS was at large distance from the catalytic module. State of the art experimental tools, including the spatially resolved measurement of temperature and concentration profiles were used to characterize the thermal behavior of the various configurations. Detailed kinetic modeling supported the analysis of data. The results showed that, at the expense of a small loss of thermal efficiency, a very moderate loss of performance in terms of conversion and selectivity, but, remarkably, an important reduction of the surface inlet temperatures were achieved. Preliminary experiments with propane/air mixtures suggest that the adoption of a moderately dispersive reactor can represent a promising solution for the stable operation of catalytic units treating heavier fuels than methane.

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“…Micro-channeled reactors are highly promising for this purpose due to their high surface-to-volume ratio and high rates of heat and mass transfer compared with conventional reactors [6][7][8][9]. At present, it is a crucial issue for microchanneled reactors to develop efficient and inexpensive heterogeneous catalysts.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity of Pre-Activated Ni3Al Foil Catalysts for Hydrogen Production from Methanol under Steam Addition

Jang

Chun

et al. 2010

Catal Lett

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Cold-rolled Ni 3 Al foils were found to be spontaneously activated up to a high level during methanol decomposition, forming Ni particles on the foil surface. Utilizing this characteristic phenomenon, we pre-activated the Ni 3 Al foils and subsequently examined the catalytic properties under steam addition to methanol (steamto-carbon ratio (S/C) = 0-1.0). The pre-activated foils exhibited high catalytic activity for methanol decomposition from the beginning of the reaction under steam addition and sustained the activity during the entire reaction time. Surface analyses revealed that the Ni particles formed by the pre-activation treatment survived after the reaction at all S/Cs, attributing to the high catalytic activity.

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Temperature profiles and residence time effects during catalytic partial oxidation and oxidative steam reforming of propane in metallic microchannel reactors

Cited by 72 publications

References 54 publications

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

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

Optimal Design of A CPO-Reformer of Light Hydrocarbons with Honeycomb Catalyst: Effect of Frontal Heat Dispersions on the Temperature Profiles

Catalytic Activity of Pre-Activated Ni3Al Foil Catalysts for Hydrogen Production from Methanol under Steam Addition

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