TY - JOUR
T1 - Highly dispersed manganese oxide catalysts grafted on SBA-15
T2 - Synthesis, characterization and catalytic application in trans-stilbene epoxidation
AU - Tang, Qinghu
AU - Hu, Shuangquan
AU - Chen, Yuanting
AU - Guo, Zhen
AU - Hu, Yu
AU - Chen, Yuan
AU - Yang, Yanhui
PY - 2010/8
Y1 - 2010/8
N2 - Manganese oxide catalysts supported on mesoporous silica SBA-15 (Mn-SBA-15) were synthesized following a controlled post-synthesis grafting process through the atomic layer deposition. N2-physisorption, X-ray diffraction, transmission electron microscopy, Raman spectroscopy, H2 temperature-programmed reduction, diffuse reflectance UV-Vis, and X-ray absorption near-edge structure were employed to characterize the physicochemical properties. This grafting method can efficiently upload a large amount of Mn species, and the Mn-SBA-15 samples exhibited high surface area, large pore volume, and uniform pore size. The spectroscopic results revealed that the manganese oxides with the coexistence of Mn2+ and Mn3+ either highly dispersed on the mesoporous silica surface or formed small size MnOx clusters in the SBA-15 channels depending on the manganese oxide contents. These manganese catalysts with ordered pore structure exhibited superior activity and selectivity towards desired product in the liquid-phase epoxidation of trans-stilbene using tert-butyl hydroperoxide as the oxidant.
AB - Manganese oxide catalysts supported on mesoporous silica SBA-15 (Mn-SBA-15) were synthesized following a controlled post-synthesis grafting process through the atomic layer deposition. N2-physisorption, X-ray diffraction, transmission electron microscopy, Raman spectroscopy, H2 temperature-programmed reduction, diffuse reflectance UV-Vis, and X-ray absorption near-edge structure were employed to characterize the physicochemical properties. This grafting method can efficiently upload a large amount of Mn species, and the Mn-SBA-15 samples exhibited high surface area, large pore volume, and uniform pore size. The spectroscopic results revealed that the manganese oxides with the coexistence of Mn2+ and Mn3+ either highly dispersed on the mesoporous silica surface or formed small size MnOx clusters in the SBA-15 channels depending on the manganese oxide contents. These manganese catalysts with ordered pore structure exhibited superior activity and selectivity towards desired product in the liquid-phase epoxidation of trans-stilbene using tert-butyl hydroperoxide as the oxidant.
KW - Epoxidation
KW - Grafting method
KW - Manganese
KW - SBA-15
KW - trans-Stilbene
UR - http://www.scopus.com/inward/record.url?scp=77953293936&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2010.03.033
DO - 10.1016/j.micromeso.2010.03.033
M3 - 文章
AN - SCOPUS:77953293936
SN - 1387-1811
VL - 132
SP - 501
EP - 509
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 3
ER -