IR spectroscopic study of the effects of high pressure on zeolites Y, A and sodalite

Abstract

In this work, we present the effect of high external pressure on the structures of several representative zeolites: zeolite Y (Na-Y), lithium exchanged zeolite A (Li-A) and sodalite, as studied by IR spectroscopy. Pressure-induced amorphization was observed at 19 and 18 kbar in Na-Y and Li-A, respectively. However, the amorphous phases formed under such pressures seem to be reversible. The structural memory of the glasses might be due to the presence of hydrated charge balancing cations. Sodalite, on the other hand, exhibited no phase change in the pressure range of 0–48 kbar.