The occurrence and extent of selective dielectric heating with microwaves (MW) and radio waves (RW) was studied with a variety of model systems using temperature-programmed desorption (TPD). Over a wide pressure and temperature range, selectivity effects were neither found for polar adsorbates (compared to non-polar compounds) nor expressed by an overheating of metal clusters supported on a nearly MW-and RW-transparent support. In contrast, significant temperature gradients between particles consisting of materials with various dielectric losses could be established under certain conditions. The utilization of adsorbates significantly modifying the dielectric properties of a material was investigated as a further approach to initiate selective dielectric heating. Applying water as a coupling medium, a combined heat and mass transport, which we call a thermo-chromatographic pulse, can be created in a packed-bed column consisting of various zeolites. In this case, selective heating of bed zones by more than 100 K was observed. The suitability of a material for the creation of thermo-chromatographic pulses depends on its dielectric properties as well as on its sorption properties with respect to water or other coupling media. The study provided further insight into not only the potential but also the limitations of selective dielectric heating of solid materials relevant to chemical engineering, environmental technology and sorption processing.

中文翻译：

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介电加热的选择性：程序升温脱附 (TPD) 实验和热色谱脉冲的启动

使用程序升温脱附 (TPD) 的各种模型系统研究了微波 (MW) 和无线电波 (RW) 选择性介电加热的发生和程度。在很宽的压力和温度范围内，极性吸附物（与非极性化合物相比）既没有发现选择性效应，也没有通过支撑在近 MW 和 RW 透明载体上的金属簇的过热来表现。相反，在某些条件下，可以在由具有各种介电损耗的材料组成的粒子之间建立显着的温度梯度。研究了吸附物的利用显着改变材料的介电特性，作为启动选择性介电加热的进一步方法。应用水作为耦合介质，结合热和质量传输，我们称之为热色谱脉冲，可以在由各种沸石组成的填充床柱中产生。在这种情况下，观察到床区选择性加热超过 100 K。用于产生热色谱脉冲的材料的适用性取决于其介电特性以及其对水或其他耦合介质的吸附特性。该研究不仅提供了对与化学工程、环境技术和吸附处理相关的固体材料选择性介电加热的潜力和局限性的进一步了解。用于产生热色谱脉冲的材料的适用性取决于其介电特性以及其对水或其他耦合介质的吸附特性。该研究不仅提供了对与化学工程、环境技术和吸附处理相关的固体材料选择性介电加热的潜力和局限性的进一步了解。用于产生热色谱脉冲的材料的适用性取决于其介电特性以及其对水或其他耦合介质的吸附特性。该研究不仅提供了对与化学工程、环境技术和吸附处理相关的固体材料选择性介电加热的潜力和局限性的进一步了解。