微波场辅助离子交换制备NH_4^+-LSX型分子筛

Microwave field assisted ion exchange for preparation of NH_4^+-LSX molecular sieves

采用微波离子交换法对Na-LSX型沸石分子筛进行NH+4交换。在固定液固比的条件下,考察了微波功率、交换液浓度、交换温度、液固比、时间以及次数对交换度的影响,并与传统水热离子交换法进行对比。得到了微波场辅助制备NH4-LSX型沸石分子筛的最佳工艺条件。

（NH4, Na）-LSX molecular sieves are prepared by substituting Na^＋ of Na-LSX via microwave field assisted ion-exchange method. The effects of radiation power, concentration, liquid-solid ratio, temperature, exchanging time and exchanging frequency on the exchange degree are studied. This microwave field assisted ion-exchange method is also compared with the conventional aqueous solution exchange one. The optimal operation condition for preparation of NHA-LSX molecular sieves in microwave field is obtained as well.