STRUCTURAL STUDY OF TI-IV EXCHANGED K10-MONTMORILLONITE BY XRD, EXAFSAND XANES

Structural and catalytic properties of Ti-IV/K10-montmorillonite and f ine size anatase activated at different temperatures are compared. EXA FS spectra at the Ti K edge and X-ray diffraction patterns show the fo rmation of small TiO2 particles in the preparative process, which grow up with the calcination temperature. The low catalytic activity of th e fine size anatase clearly shows that the activity of the exchanged c lay is due to the exchanged Ti-IV into the K10-montmorillonite. XANES indicates that some of the titanium exchanged atoms would present a te trahedral structure and consequently behave as a strong Lewis acid.