Highly efficient olefin oxidation catalysts based on regular nano-particles of titanium-containing mesoporous molecular sieves.
Ti-MCM-41 and Ti-MCM-48 are successfully prepared by one step synthesis and post-synthesis at room temperature. The samples have been characterized by X-ray diffraction, SEM, TEM, nitrogen adsorption/desorption isotherms and UV-Vis spectroscopy. The results demonstrate the existence of an ordered mesoporous structure. The Ti species are grafted into the pure silica sieve frameworks without any evidence of the formation of non-skeleton anatase. The post-synthesis Ti-MCM-41 regular nano-particles display a higher conversion and selectivity as compared to that for both the post-synthesis Ti-MCM-48 and Ti-MCM-41 with ordinary particles, in the epoxidation of cis-cyclooctene with aqueous H(2)O(2) as an oxidant. The enhanced catalytic activity may be attributed to the existence of a higher number of isolated tetracoordinated Ti active sites and regular nano-particles, which are conducive to the affinity of the reactants with active sites.
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
Yingying
Y
Wang
Ge
G
Wang
Mu
M
Yang
Li
L
Tan
Wenjun
W
Dong
Rudy
R
Luck