Issue 22, 2023

Synthesis of titanosilicate nanoparticles with high titanium content from a silsesquioxane-based precursor for a model epoxidation reaction

Abstract

In conventional hydrothermal synthesis of porous titanosilicate materials, undesired aggregation of TiO2 species during the synthesis limits the content of active four-coordinated Ti to an Si/Ti ratio of about 40. Aiming to increase the content of active four-coordinated Ti species, we report a bottom-up synthesis of titanosilicate nanoparticles using a Ti-incorporated cubic silsesquioxane cage as a precursor, which allowed incorporating a larger number of four-coordinated Ti species in the silica matrix to reach an Si/Ti ratio of 19. Even at this relatively high Ti concentration, the catalytic activity in the epoxidation of cyclohexene over the titanosilicate nanoparticles was comparable to that of a conventional reference Ti catalyst, Ti-MCM-41, with an Si/Ti ratio of 60. The activity per Ti site was not affected by the Ti content in the nanoparticles, suggesting that well dispersed and stabilized Ti species were the active sites.

Graphical abstract: Synthesis of titanosilicate nanoparticles with high titanium content from a silsesquioxane-based precursor for a model epoxidation reaction

Supplementary files

Article information

Article type
Paper
Submitted
25 3 2023
Accepted
15 5 2023
First published
16 5 2023

Nanoscale, 2023,15, 9792-9800

Synthesis of titanosilicate nanoparticles with high titanium content from a silsesquioxane-based precursor for a model epoxidation reaction

T. Moteki, T. Sei and M. Ogura, Nanoscale, 2023, 15, 9792 DOI: 10.1039/D3NR01385E

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