TY - JOUR
T1 - Epoxidation of alkenes and their derivatives over Ti-YNU-1
AU - Shen, Xiaohua
AU - Fan, Weibin
AU - He, Yue
AU - Wu, Peng
AU - Wang, Jianguo
AU - Tatsumi, Takashi
PY - 2011/7/15
Y1 - 2011/7/15
N2 - The catalytic properties of Ti-YNU-1 for the epoxidation of various alkenes and their derivatives have been investigated in detail, and further were made a comparison with those of Ti-Beta. The much higher efficiency of Ti-YNU-1 than Ti-Beta was observed in catalyzing the epoxidation of alkenes and their electron-rich analogues. Although it was less active in the epoxidation of α,β-unsaturated ketones, it showed much higher stability. In contrast, Ti leaching from the framework sites occurred to Ti-Beta, and the leaching degree increased with the carbon number of ketones. It was also shown that the catalytic conditions, including the Ti content in samples, H 2O2/substrate ratio, reaction temperature and time, acid washing and catalyst amount, significantly influenced the activity, selectivity and H2O2 efficiency. Co-oxidation of different alkenes led to the activity and epoxide selectivity being different from those obtained in the oxidation of single olefin as a result of the differences in adsorption properties of substrates over various titanosilicates, which affected the diffusion of substrate molecules and accounted for the unique shape-selectivity of Ti-YNU-1.
AB - The catalytic properties of Ti-YNU-1 for the epoxidation of various alkenes and their derivatives have been investigated in detail, and further were made a comparison with those of Ti-Beta. The much higher efficiency of Ti-YNU-1 than Ti-Beta was observed in catalyzing the epoxidation of alkenes and their electron-rich analogues. Although it was less active in the epoxidation of α,β-unsaturated ketones, it showed much higher stability. In contrast, Ti leaching from the framework sites occurred to Ti-Beta, and the leaching degree increased with the carbon number of ketones. It was also shown that the catalytic conditions, including the Ti content in samples, H 2O2/substrate ratio, reaction temperature and time, acid washing and catalyst amount, significantly influenced the activity, selectivity and H2O2 efficiency. Co-oxidation of different alkenes led to the activity and epoxide selectivity being different from those obtained in the oxidation of single olefin as a result of the differences in adsorption properties of substrates over various titanosilicates, which affected the diffusion of substrate molecules and accounted for the unique shape-selectivity of Ti-YNU-1.
KW - Alkene
KW - Epoxidation
KW - Ti-YNU-1
KW - Titanosilicate
KW - Unsaturated ketone
UR - https://www.scopus.com/pages/publications/79959736383
U2 - 10.1016/j.apcata.2011.04.044
DO - 10.1016/j.apcata.2011.04.044
M3 - 文章
AN - SCOPUS:79959736383
SN - 0926-860X
VL - 401
SP - 37
EP - 45
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1-2
ER -