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Effects of Temperature on Relaxation Time and Electrical Conductivity of Spent Automobile Catalyst at Microwave Frequencies

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Abstract

Dielectric properties are some of the main parameters of materials, determining their interaction with electromagnetic energy during microwave heating. The dielectric properties of spent automobile catalyst were measured by using the resonance cavity perturbation technique from room temperature to 800°C at 915 MHz and 2450 MHz. The effects of temperature and frequency on the dielectric constant, dielectric loss factor, loss tangent, and penetration depth were studied. The results indicate that spent automobile catalyst is weakly polar, making it difficult to transform electromagnetic energy into heat. The relaxation time and conductivity obtained by numerical calculations further explain from the microlevel that spent automobile catalyst cannot dissipate electromagnetic energy through dipole loss or conduction loss under microwave irradiation. This work describes an effective way to explore the dielectric heating mechanism and a basis for understanding the interactions between microwaves and spent automobile catalyst.

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Acknowledgement

This work was supported by the National Natural Science Foundation of China (Nos. 51664037, U1402274, and 51504217).

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Authors and Affiliations

  1. Faculty of Science, Kunming University of Science and Technology, Kunming, 650500, People’s Republic of China

    Guangjun He & Wenwen Qu

  2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Guangjun He, Wenwen Qu, Shaohua Ju, Chenhui Liu, Peng Liu, Shixing Wang & Libo Zhang

  3. Yunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming, 650093, People’s Republic of China

    Guangjun He, Wenwen Qu, Shaohua Ju, Chenhui Liu, Peng Liu, Shixing Wang & Libo Zhang

  4. National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming, 650093, People’s Republic of China

    Guangjun He, Wenwen Qu, Shaohua Ju, Chenhui Liu, Peng Liu, Shixing Wang & Libo Zhang

  5. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    Guangjun He, Shaohua Ju, Peng Liu, Shixing Wang & Libo Zhang

  6. Key Laboratory of Resource Clean Conversion in Ethnic Regions, Education Department of Yunnan Province, School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, People’s Republic of China

    Chenhui Liu

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  1. Guangjun He
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Correspondence to Shixing Wang or Libo Zhang.

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He, G., Qu, W., Ju, S. et al. Effects of Temperature on Relaxation Time and Electrical Conductivity of Spent Automobile Catalyst at Microwave Frequencies. JOM 71, 2353–2359 (2019). https://doi.org/10.1007/s11837-019-03524-6

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  • DOI: https://doi.org/10.1007/s11837-019-03524-6

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