Catalytic partial oxidation of methane to synthesis gas

Heitnes, K.; Lindberg, Seth; Rokstad, O.A.; Holmén, Anders

doi:10.1016/0920-5861(95)00027-d

Cited by 75 publications

(34 citation statements)

References 15 publications

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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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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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“…Therefore, the temperature of the catalyst in the combustion zone is expected to be very high. As a result, a large temperature gradient will appear in the catalyst bed during the catalytic partial oxidation of methane [13,[15][16][17][18]. In addition, the hot spot, in which the temperature expectedly becomes much higher than other places in the reactor, is one of the main difficulties in operating the partial oxidation [19][20][21].…”

Section: Introductionmentioning

confidence: 98%

“…(1)) and www.elsevier.com/locate/apcata Applied Catalysis A: General 275 (2004) 157-172 CO 2 (Eq. (4)) [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Temperature profiles of alumina-supported noble metal catalysts in autothermal reforming of methane

Maruyama

Nurunnabi

et al. 2004

Applied Catalysis A: General

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“…CO 2 + 2H 2 O). The exact pathway of partial oxidation is debated; direct oxidation of surface carbon to CO has been proposed in short contact time reactors [11,12], while an indirect mechanism-combined combustion followed by reforming has been postulated [13].…”

Section: Introductionmentioning

confidence: 99%