Synthesis of TS-2 in the system SiO2-TiO2-H2O2-TBAOH. Influence of the synthesis variables

The present paper describes the synthesis, characterization and catalytic a ctivity of a titanium silicalite (TS-2) prepared by a method based on the f ormation of peroxytitanates. The samples were characterized by X-ray diffra ction (XRD), FT-IR, UV-Vis, SEM and catalytic measurements for n-hexane oxy functionalization. The influence of the synthesis procedure, the crystallization temperature a nd the SiO2/TiO2 molar ratio on the physicochemical properties of the produ cts are discussed. The maximum incorporation of titanium observed was about a Ti/(Si+Ti) ratio of 0.04. TiO2 was not formed as can be seen by DR-UV-Vi s spectroscopy. An increase in the crystallization temperature above 461 K leads to the formation of MFI phase as impurity. Furthermore the effect of the synthesis temperature on the crystallization curves and the kinetic par ameters was also investigated. (C) 1999 Elsevier Science B.V. All rights re served.