Solid state NMR study of Mo-P-Al oxide catalysts

Solid state Al-27 NMR and especially Al-27 MQMAS is used to characterize th e oxide Mo-P-Al hydrotreating catalysts, This application shows that NMR is an efficient method to determine the local structure of the elements in th e amorphous catalysts. So, this permits to conclude that the association of the Mo and the P leads to the formation of aluminium phosphates and that d ifferences in the structure depend on the method of preparation.