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用不同钙离子浓度对NaY沸石分子筛进行改性,得到一系列不同交换度的样品,用高真空重量法测定了样品在25℃和120℃时的吸附等温线,求得样品在5mmHg(～1.2℃)时从25℃升温到120℃的脱水量;从热重分析得出样品的脱水速率和脱附活化能,脱附活化能都在10千卡以下。利用自行设计的制冷模拟装置测定了样品的制冷容量;发现制冷容量与样品的脱附活化能、脱水速率和脱附量之间存在很好的平行关系,脱附活化能低的样品,其制冷容量较高。
NaY zeolite was modified with different calcium ion concentration to obtain a series of samples with different exchange degrees. The adsorption isotherms of the samples at 25 ℃ and 120 ℃ were determined by high vacuum gravimetry. ℃) from 25 ℃ to 120 ℃ dehydration; dehydration rate and desorption activation energy obtained from the thermal gravimetric analysis, desorption activation energy are below 10 kcal. The refrigerating capacity of the sample was measured by a self-designed refrigeration simulation device. It was found that there was a good parallel relationship between the refrigeration capacity and the desorption activation energy, the dehydration rate and the desorption capacity of the sample. The sample with low desorption activation energy Higher capacity.