Synthesis of Ti-MCM-41 using colloidal silica and titanium trichloride - II. Characterization of Ti-MCM-41 molecular sieve

The Ti-MCM-41 molecular sieve synthesized with colloidal silica and titaniu m trichloride has been characterized by nitrogen adsorption, TG-DTA and spe ctroscopies of FT-IR, UV-Vis and UV-Raman. N-2 adsorption isotherms reveal that with the incorporation of titanium into the framework of the molecular sieve, the pore size decreases and the wall thickness increases. TG and DT A profiles suggest that different template sorption sites exist in the fram ework of Ti-MCM-41. FT-IR, UV-Vis and UV-Raman spectra indicate that the fo rmation of anatase TiO2 can be avoided during the preparation of the synthe sis gel and the crystallization of the molecular sieve. Most Ti4(+) ions ar e isolated and tetrahedrally coordinated in the framework of MCM-41.