Abstract
Properties of dehydrated Na12 − 2xCa x -A zeolites with x = 0, 1.1 and 4 in microwave heating were experimentally and theoretically investigated and compared with one another. Final heating temperatures of zeolites by microwave radiation were measured against radiation time and the easiness of heating was in the order of Na12-A ≫ Na10Ca1-A > Na4Ca4-A for every irradiating condition studied. Microwave (relative) absorption efficiencies of the zeolites were calculated as a function of temperature with a simple method by using dielectric properties of the dehydrated states. In every temperature calculated, the order of absorption efficiency was Na12-A ≫ Na10Ca1-A ≈ Na4Ca4-A. From these results, it was clearly verified that Na+ ion on the site III played the most important role in absorbing microwaves because Na12-A has one Na+ ion on the site III but Na10Ca1-A and Na4Ca4-A have no cations on the site.
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