PHASE TRANSFORMATION OF ION-EXCHANGED TITANO SILICATE MATERIAL

Abstract

The phase transformation and thermal stability of  Co²⁺ and Cu²⁺-exchanged titanium silicate ETS-10 material, prepared by using cobalt (II) and copper (II) nitrate solution, and subsequent calcinations at different temperatures and cooled down to room temperature, were investigated by  X-ray Powder Diffraction (XRD), Scanning Electronic Microscope (SEM), Elemental and Thermal Analysis. It found that the metal (II) exchanged ETS-10 material exhibits a high thermal stability at 723K.

The microspore system of Co²⁺-exchanged ETS-10 material changes into Narsarsukite (NaM²⁺TiOSi4O10) structure upon thermal treatment at 1023K, a further structure transformation into Rutile (TiO₂), Cobalt oxide (CoO), and Tridymite (SiO₂) materials upon heating the sample at 1223K.

The formation of Narsarsukite, Rutile and Tenorite (CuO) occurs when the sample of Cu²⁺-exchanged titanium silicate ETS-10 heated at 1023K. Phase transformation into Rutile, Tenorite and Tridymite materials upon heating Cu²⁺-exchanged ETS-10 material at 1223K.