Study of lanthanum ion-exchanged zeolite NaY by solid-state nuclear magnetic resonance spectroscopy

Abstract

The ²⁹Si chemical shifts of dehydrated and rehydrated lanthanum-exchanged zeolite NaY are found to shift to up-field with increasing lanthanum content. The spectrum of a dehydrated sample can be rationalized by assuming that each of the four Si(nAl) lines splits into two lines with an intensity ratio equal to the Na/La equivalent ratio. This result shows that the effect of the La ions on the Si nuclei can be distinguished from that of the Na ions.