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Critical evaluation of in situ probe techniques for catalytic honeycomb monoliths

Paper ID Volume ID Publish Year Pages File Format Full-Text
54569 47016 2013 9 PDF Available
Title
Critical evaluation of in situ probe techniques for catalytic honeycomb monoliths
Abstract

•CFD modeling of suction probe technique for partial oxidation in catalytic monoliths.•Strong influence of the probe on concentration profiles (dependent on its position).•Correction of measurement errors only possible for isothermal conditions.•Good agreement between measurements and calculations that take probe into account.

Collecting spatially resolved gas-phase concentration profiles in catalytic monoliths by applying suction probe techniques has become an important tool for understanding the reaction sequence and for optimizing the design of structured catalysts. Here, the significance of the probing technique’s impact on the measured data is investigated by means of CFD simulations and experimental investigation of catalytic partial oxidation of CH4 on a Rh-coated honeycomb catalyst. Different positions of a suction probe (diameter = 170 μm) inside a rectangular channel (height = 795 μm) of a monolith are compared with respect to the influence on flow field, residence time, and reaction progress. The influence of the probe on the measured data is shown to strongly depend on its position. The maximum error can be over 50% with respect to the residence time. For an isothermal process, the error in the concentration profiles can be corrected by using a function which is only dependent on the geometrical structure of the monolith. However, for a process with a temperature gradient along the catalytic channel, such as CPOX of methane, the correction function is not applicable. An appropriate comparison of experiments and simulations requires a three-dimensional CFD simulation taking the probe into account.

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Keywords
CFD; Suction probe technique; Spatial profile sampling; In situ measurement; Fuel reforming; Catalytic monolith
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Critical evaluation of in situ probe techniques for catalytic honeycomb monoliths
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 216, 1 November 2013, Pages 2–10
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