KCl、NaCl 在分子筛载体上的分散阈值研究

DISPERSION CAPACITIES OF KCl AND NaCl IN ZEOLITES

采用高温衍射仪研究了KCl 和NaCl.和在不同分子筛载体内孔和内表面的分散阈值.实验结果表明,分散阈值显著地与烘烤温度有关,烘烤温度愈高,分散阈值愈大.吸附水和固态离子交换反应也影响分散阈值大小.用盐类溶液浸渍分子筛在低温烘烤时的分散效果与高温加热盐类和分子筛干混样品的分散效果大不相同.例如,浸渍时KCl 在分子筛载体上分散很少,这主要归因于吸附水对KCl 的竞争吸附.

High-temperature X-ray diffractometer is employed to study the dispersion capacities of KCIand NaCl in zeolite supports.The capacities are strongly affected by temperature.The higherthe temperature is,the greater the capacities are.It was also found that the capacity obtained byimpregnating and drying at low temperature is much smaller than that obtained by impregnatingand heating at high temperature.For example,only a small amount of KCl can disperse into NaAZeolite pores by impregnating,and this is most likely owing to the competition adsorption of waterand the salt in zeolite pores.