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<p>The dielectric properties of spent automobile catalysts play a crucial role in microwave roasting processes. However, conventional measurement methods face significant challenges in determining these properties at elevated temperatures. In this study, the dielectric properties of spent automobile catalysts mixed with 0–12 wt.% sodium bisulfate (NaHSO<sub>4</sub>) were measured at 2.45&#xa0;GHz across a temperature range of 25–800&#xa0;°C. Results showed that the microwave absorbing properties are enhanced with increasing NaHSO<sub>4</sub> content. The microwave roasting mechanism of spent automobile catalyst involves a dual-loss process, primarily governed by conductivity loss and secondarily by dipole loss. Several classic mixture rules were applied to predict the dielectric properties of spent automobile catalysts mixed with a substantial amount of NaHSO<sub>4</sub> during microwave roasting. The calculations indicated that the Lichtenecker equation effectively describes the temperature-dependent variation of the dielectric constant, while the exponential model accurately depicts the temperature-dependent variation of the dielectric loss factor with temperature. The accuracy of the computational results was quantitatively validated through dielectric property testing experiments (25–250&#xa0;°C) and qualitatively confirmed by microwave heating experiments (25–700&#xa0;°C). The dielectric property data presented in this article serve as a foundation for optimizing the microwave roasting processes for spent automobile catalysts. Moreover, the methodology employed here also offers a valuable reference for determining the dielectric properties of analogous materials.</p>

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Dielectric Properties and Absorbing Properties of Spent Automobile Catalyst Mixed with Sodium Bisulfate During Microwave Roasting

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Guangjun He,
  • Nanhai Zhang,
  • Deyan Liu,
  • Qinghe Song,
  • Rui Zhang

摘要

The dielectric properties of spent automobile catalysts play a crucial role in microwave roasting processes. However, conventional measurement methods face significant challenges in determining these properties at elevated temperatures. In this study, the dielectric properties of spent automobile catalysts mixed with 0–12 wt.% sodium bisulfate (NaHSO4) were measured at 2.45 GHz across a temperature range of 25–800 °C. Results showed that the microwave absorbing properties are enhanced with increasing NaHSO4 content. The microwave roasting mechanism of spent automobile catalyst involves a dual-loss process, primarily governed by conductivity loss and secondarily by dipole loss. Several classic mixture rules were applied to predict the dielectric properties of spent automobile catalysts mixed with a substantial amount of NaHSO4 during microwave roasting. The calculations indicated that the Lichtenecker equation effectively describes the temperature-dependent variation of the dielectric constant, while the exponential model accurately depicts the temperature-dependent variation of the dielectric loss factor with temperature. The accuracy of the computational results was quantitatively validated through dielectric property testing experiments (25–250 °C) and qualitatively confirmed by microwave heating experiments (25–700 °C). The dielectric property data presented in this article serve as a foundation for optimizing the microwave roasting processes for spent automobile catalysts. Moreover, the methodology employed here also offers a valuable reference for determining the dielectric properties of analogous materials.