Group behaviour of SAPO-11 molecular sieves containing various metals (Mg, Zn, Mn or Cd, Ni, Cr)

Abstract

Derivatives of SAPO-11 containing Mg, Zn, Mn, Cd, Ni and Cr as heteroatoms have been synthesized. These additions influence considerably both the properties and the morphology of the crystalline phases synthesized. The products noted as MeAPSO-11 were investigated with light microscopy, scanning electron microscopy (SEM), electron microprobe analysis (EPM), X-ray diffraction (XRD), temperature-programmed XRD, differential thermal analysis (DTA), thermogravimetry (TG), magic-angle spinning nuclear magnetic resonance (MAS NMR) and wet chemical analysis. The materials can be clearly divided into two groups: (1) Mg, Zn or Mn, or (2) Cd, Ni or Cr containing preparations. The results suggest that all metals are incorporated into the framework of SAPO-11 molecular, sieve, though in rather different amounts. The content of heteroatoms decides the properties of the synthesized molecular sieves.