Ti/BMMs (Ti supported bimodal mesoporous silica) catalysts have been prepared via self-assembly route combined with ship-in-a-bottle method. The recovery and recycling performances of Ti/BMMs were investigated in the epoxidation of cyclohexene. In order to the evaluate the regeneration methods and to examine the deactivation behaviors

the deactivated Ti/BMMs catalysts were washed in chloroform or calcinated at 450℃ for 6 h and then activity of the recovery catalysts were examined.Meanwhile

the structure features and surface properties of the regenerated catalysts were characterized by X-ray diffraction

N

2

-sorption analysis

scanning electron microscopy

transmission electron microscopy

Fourier transform infrared spectroscopy

thermogravimetric analysis

UV visible spectroscopy and X-ray photoelectron spectroscopy. The results showed that the typical bimodal mesoporous structure of recycled Ti/BMMs catalysts was still maintained

and the phenomenon of Ti leaching during the catalytic process and recovery was negligible. In particular

spectroscopic observations indicated that the effects of the regeneration methods on the tetrahedrally-coordinated Ti species and

catalytic deactivation were remarkable. The main reasons were related to the polarities of used solvents during recovery tests

the environment medium of adsorbed water inside mesopore channels and the deposition of bulky molecules of by-products on the mesoporous surface.