Abstract
This chapter presents the characterisation of TS-I active sites by adsorption of organic probe. Ultravilet-visible-infrared (UV-Vis-IR) spectroscopy shows the involvement of titanium (Ti) sites of TS-1 in the adsorption of oxygenated probes and pyridine. The interaction affects the infrared (IR) signal at 3725 cm -l , which is tentatively attributed to TiOH groups. In partially hydrated TS-1, lattice Ti is involved in the sorption of organic molecules directly through one hydroxyl (OH) group and indirectly influencing the environment through the nearest SiOH groups. S-1 shows in the comparison with TS-1 a lower density and a weaker strength of adsorption of the organic probes. The interaction of the probes with Ti sites is reinforced through co-operative H-bonds in MFI zeolitic structure while in the amorphous mesoporous titanium–silicalite this phenomenon is less relevant.
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