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The synthesis of titanium-containing MCM-41 mesoporous molecular sieves in the presence of dye molecules results in a well developed hexagonal structure if the powder dye is dissolved in a surfactant solution. These materials contain titanium species in tetrahedral and octahedral coordinations simultaneously, indicated (i) by absorption bands at 960 cm -1 in the infrared and Raman spectra,...
The comparison of the temporal development of the X-ray reflection intensities of as-synthesized and calcined MCM-41 materials demonstrates that 90% of the hexagonal channel arrangement is formed after 5-6 h whereas the fully developed mesopore structure requires 72 h. The progress of the reaction can be quantified by reference to the maximum pore volume that can be obtained from adsorption isotherms...
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