Abstract
Calcined Ti-MCM-41 was silylated by trimethylchlorosilane in the vapor phase for 2–9 h. 29Si MAS NMR spectroscopic study showed that Ti-MCM-41 silylated for 2–5 h exhibited a peak at 11 ppm, which was assigned to (CH 3) 3SiOSi(OSi) 3 species. Further silylation of Ti-MCM-41 for 5–9 h gave an additional peak at 5.1 ppm, which was assigned to novel titanium species of (CH 3) 3SiOTi(OSi) 3. Ti-MCM-41 silylated for 5 h showed relatively high activity in hydroxylation of benzene and epoxidation of 1-octene compared with calcined Ti-MCM-41. More important, Ti-MCM-41 silylated for 9 h gave much higher activity than Ti-MCM-41 silylated for 5 h. 29Si MAS NMR spectra showed the presence of the titanium species of (CH 3) 3SiOTi(OSi) 3 in Ti-MCM-41 silylated for 5–9 h, and these can be better catalytically active sites than conventional titanium species in Ti-MCM-41.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
