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Methane auto-thermal reforming on honeycomb and foam structured catalysts: The role of the support on system performances

Paper ID Volume ID Publish Year Pages File Format Full-Text
54573 47016 2013 8 PDF Available
Title
Methane auto-thermal reforming on honeycomb and foam structured catalysts: The role of the support on system performances
Abstract

•A total self-sustained ATR system was set-up: no external heat sources are needed.•Temperature and composition monitoring of process stream along catalytic bed.•Activity tests of honeycomb and foam structured catalysts.•The relevance of stream mixing along catalytic bed was observed.•Correspondence between catalyst thermal management and performance was found.

In this work a compact catalytic reactor was set-up for the ATR of CH4 as natural gas surrogate. Structured catalysts (commercial honeycomb and foam monoliths) performances in CH4 processing were studied. In reactor design, great attention was paid to the thermal integration, in order to obtain a total self-sustainability of the process avoiding additional external heat sources, so improving the plant compactness. Through a heat exchange system integrated in the reactor, water and air stream are preheated by exploiting the heat from exhaust stream, allowing to feed reactants at room temperature and cooling product stream up to a temperature suitable for further purification stages (Water Gas Shift, Preferential Oxidation). In order to have a very comprehensive process analysis, temperatures and composition were monitored in 6 point along the catalytic bed.The influence of catalytic system geometry and the thermal conductivity in the process performances were analyzed. Preliminary tests showed high thermal system efficiency, with a good hydrocarbon conversion at the selected operating condition for both catalyst typologies. The stream mixing along the catalytic volume appeared a crucial issue in order to increase hydrocarbon conversion and thus hydrogen yield: to obtain a chaotic reaction stream flux along catalytic bed allows to reduce temperature and composition radial gradients, and as a consequence the system quickly approach to thermodynamic equilibrium. On the other hand, continuous catalytic bed improves conductive heat transfer mechanisms, resulting in very flat thermal profiles.

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Keywords
Structured catalysts; Methane ATR; Thermal integration; Thermal profiles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 216, 1 November 2013, Pages 30–37
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us