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Effect of the thermal conductivity of metallic monoliths on methanol steam reforming

Paper ID Volume ID Publish Year Pages File Format Full-Text
53231 46955 2016 9 PDF Available
Title
Effect of the thermal conductivity of metallic monoliths on methanol steam reforming
Abstract

•Heat transfer characteristics and MSR performance in monoliths have been studied.•Axial and radial thermal conduction play an important role in heat transfer and MSR.•Monolith with lower cell density presents more marked temperature profiles.•The average monolith temperature increment results in a higher MSR conversion.

We have studied the influence of cell density of two sets of metal monoliths coated with different amounts of Pd/ZnO in the methanol steam reforming (MSR). The results indicate that the conversion increases with increasing size of the channels that is accompanied by a decrease in the monoliths cell density. To explain this unexpected result, the longitudinal and radial temperature profiles were measured. It was observed that the thermal conductivity increased with increasing cell density and temperature profiles became more marked with increasing catalyst loading on the monolith. This last result was explained by the increase of the heat required for the reaction to maintain a constant space velocity. Being fixed central temperature of the monolith and being the MSR an endothermic reaction, the average temperature increases with decreasing thermal conductivity. To assess whether this increase in average temperature justifies the observed increase in conversion, a CFD modeling of the system was performed. The simulation results showed an excellent agreement with experimental values. This confirms the fundamental role of thermal conductivity, which is mainly controlled by the cell density of the monolith.

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Keywords
Heat transfer; Metallic monolith; Methanol steam reforming (MSR); Temperature profile; Thermal conductivity
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Effect of the thermal conductivity of metallic monoliths on methanol steam reforming
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 273, 15 September 2016, Pages 131–139
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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