Abstract
For three dehydrated zeolite A samples, heated behaviors in microwave (f = 2.45 GHz) irradiation were measured. In addition, the relative energy absorption ratios for microwaves among the three zeolites were theoretically calculated as a function of temperature, and properties obtained by the calculations and measurements were compared with each other. During the irradiation under every condition, the heated temperatures were in the order of Na12-A > K12-A > Na4Ca4-A. The magnitude of the energy absorption ratio was the same as the order of the heated temperature. It was found that the absorption ratio calculated by the present method can correctly reflect the heated behaviors of zeolites in microwave irradiation. The dielectric relaxation loss (relax II) that appeared in the higher frequency side had a decisively important influence on the absorption of microwaves. A zeolite with a lower activation energy of cation movement (or more mobile cations) was more easily heated by microwaves.
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