Post-synthetic preparations of titanium-containing mesopore molecular sieves

Titanium-substituted mesoporous molecular sieves were prepared post-synthet ically by applying Ti-butoxide in ethanol solutions of different concentrat ions to MCM-41, MCM-48, and KIT-1. The catalysts obtained were characterize d by XRD, FT-IR, UV-Vis spectroscopies, XAS, and N-2 physisorption. Incorpo ration of Ti seems to promote further crosslinking of the mesoporous walls of the samples, and resulted in wall thickness increases. The post-syntheti cally prepared Ti-mesoporous derivatives using titanium butoxide grafting w ere catalytically active for the selective oxidation of 2,6-di-tert-butylph enol with H2O2 Their activities depended on the Ti concentration of the cat alysts. Comparison works with hydrothermally prepared Ti-MCM-41, Ti-HMS or post-synthetically prepared Ti-mesopore catalysts, either using titanocene grafting or by TiCl4 atom planting method, are also reported. (C) 1999 Else vier Science B.V. All rights reserved.