Desorption durch Mikrowellen unter Vakuum

In the present study, the astonishing influence of water dosage on a purged dry packed bed of NaY zeolite in the presence of an electric field with a frequency of 13.56 MHz was investigated. The injection of a small amount of water to the inlet of the bed led to pronounced selective heating of the inlet zone by more than 150 K. Thus, water represented a very effective coupling medium for dielectric heating. The selectively heated zone then slowly moved through the whole packed bed and a water pulse finally left the zeolite. This effect correlated with a coupled water and heat flux was called thermo-chromatographic pulse (TCP) emphasizing its analogy to chromatography. The phenomenon could not be performed by using conventional (convective) or microwave heating. It was demonstrated under various conditions and explained by a new model based on own experimental results as well as data from literature. The model will be the objective of a forthcoming publication.

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Migrating Temperature “Thermo-Chromatographic” Pulses (TCP) Initiated by Radio-Frequency (RF) Heating

Kraus

Kopinke

Roland

2012

Journal of Microwave Power and Electromagnetic Energy

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Modeling of a Thermo-chromatographic Pulse (TCP) as Radio-frequency (RF)-induced Selective Heating Effect

Kraus

Kopinke

Roland

2013

Journal of Microwave Power and Electromagnetic Energy

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By utilizing the specific influence of water adsorption on the dielectric loss factor and, consequently, selective heating of the zeolite NaY in a radio-frequency (RF) electromagnetic field, a hot zone moving through the packed bed can be realized initiated by water injection. While the effect of water adsorption on RF heating and the phenomenon of the thermo-chromatographic pulse (TCP) itself were described in a previous paper, the present study presents a detailed model for the description and explanation of this effect. It involves the complex dependence of dielectric loss on temperature and moisture content, a diffusion model considering both hopping and Knudsen mechanisms and a power balance for a representative segment of the packed bed. The developed model was successfully applied to adequately describe various experimental situations observed for selective RF heating in a NaY zeolite bed.

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Desorption durch Mikrowellen unter Vakuum

Abstract: No abstracts.

Cited by 2 publications

References 5 publications

Migrating Temperature “Thermo-Chromatographic” Pulses (TCP) Initiated by Radio-Frequency (RF) Heating

Migrating Temperature “Thermo-Chromatographic” Pulses (TCP) Initiated by Radio-Frequency (RF) Heating

Modeling of a Thermo-chromatographic Pulse (TCP) as Radio-frequency (RF)-induced Selective Heating Effect

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