Spatiotemporal Temperature and Concentration Measurements in a Monolith Reactor

Date

2015-12

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Abstract

Honeycomb reactor is often used in pollution abatement applications. A typical commercial honeycomb reactor is made of a ceramic material, which is deposited with the high surface area washcoat carrier such as Al2O3. The polluted gases enter the reactor channels and diffuse through this porous structure to the catalytic sites where they are converted to less harmful gases. Stringent environmental regulations have driven the markets toward increasing engine efficiencies and better after-treatment strategies. Achieving high hydrocarbon conversion requires comprehensive information about the thermal and concentration fields inside the monolith reactor. The concentration fields can be studied by a Spatially Resolved Capillary Inlet Mass Spectrometer technique (Spaci-MS). On the other hand, the temperature field is often measured by positioning thermocouples at various locations inside the monolith channel, which can be intrusive to the reactor and not suitable for fast transient processes. To overcome this limitation, I use a new optoelectronic technique called coherent optical frequency domain reflectometry (c-OFDR). This technique enables instant temperature measurement along a fiber with high spatial and temporal resolutions. The objectives of my works are: i) illustrate the capability of the c-OFDR method to measure transient temperature inside the monolith channel, ii) employed c-OFDR method to analyze the veracity of the concentration measurement by the Spaci-MS probe, iii) develop the experimental setup combining the c-OFDR and Spaci-MS techniques to study the dynamic behaviors of the Pt/CeO2/Al2O3 catalyst system under periodic lean-rich operation.

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Keywords

SpaciMS, C-OFDR, Wrong way behavior, Monolith reactor, Ceria catalyst

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