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The local structures around cesium and sodium in the zeolites X containing cesium in excess of the ion-exchange capacity (cesium-added zeolite X ) were examined by 133 Cs and 23 Na MAS NMR to elucidate the location of the added cesium and the formation of the basic sites caused by addition of the excess cesium. The cesium species located in the intracrystalline cavities of zeolite...
The basic zeolites X which contain alkalis (K, Rb, Cs) in excess of the ion-exchange capacity (alkali-added zeolite X) showed an activity for 1-butene isomerization at 273 K, whereas alkali ion-exchanged zeolite X showed almost no such activity. The activities of the different alkali-added zeolites were in the following order: Cs-added zeolite X > Rb-added zeolite X > K-added zeolite X ≫ Na-added...
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