Quantification of electric-field gradient in the supercage of Y zeolites with ~(131)Xe(l=3/2) NMR

摘要

The electric-field gradients in the supercage of HY and steam-dealuminated Y zeolites have been quantified using one-dimensional nutation NMR applied to physisorbed ~(131)Xe.Their values are 1.25 and 0.81·10~(19)V·m~(-2),respectively.The composite-pulse sequence used to detedt ~(131)Xe signal also cancles the ringing signals fro the NMR probe head.The fitting program for extracting the quadrupole coupling constant from the nutation NMR data is available in the web site http:www.pascal-man.com.