Synthesis of thermal stable mesoporous titanosilicates assembled from titanosilicates precursors at high temperature

•  A series of MTS-9 synthesized from assembly TS-1 precursors with P123 in 100-180ºC.
• MTS-9 samples contain both primary and secondary structural building units of TS-1.
•  MTS-9180 promotes a higher condensation of Ti-containing silica networks.
• Higher temperature is responsible for the increased thermal stability of MTS-9180.

A series of mesoporous titanosilicates (MTS-9x) are synthesized in an acidic media from titanosilicate precursors with a polymer surfactant (P123) under temperatures ranging from 100 to 180 °C. Characterization and analysis show that the hexagonal mesoporous titanosilicates (MTS-9x) contain both primary and secondary structural building units of TS-1 zeolite in their framework, in a manner similar to MTS-9. Furthermore, 29Si NMR spectral analysis suggests that MTS-9180 synthesized at 180 °C promotes a higher condensation of Ti-containing silica networks in the mesoporous walls compared to MTS-9100 synthesized at 100 °C. The higher synthesis temperature may also be responsible for the increased thermal stability of the four-coordinated titanium species in MTS-9180, which was verified by UV–vis spectral analysis. Catalytic experiments indicate that MTS-9180 shows high hydroxylation activity, regardless of calcination, for both small organic molecules such as phenol and bulky organic molecules such as 2,3,6-trimethylphenol. Moreover, the recycled catalyst retains a high conversion, confirming the high thermal stability of the titanium species.

A series of mesoporous titanosilicates (MTS-9x) are synthesized in an acidic media from titanosilicate precursors with a polymer surfactant (P123) under temperatures ranging from 100 to 180 °C. The higher synthesis temperature may be responsible for the increased thermal stability of the four-coordinated titanium species in MTS-9180, which was verified by UV–vis spectral analysis.Figure optionsDownload as PowerPoint slide