Preparation of hydrophobically modified single-site Ti-containing mesoporous silica (TiSBA-15) and their enhanced catalytic performances
Preparation of hydrophobically modified single-site Ti-containing mesoporous silica (TiSBA-15) and their enhanced catalytic performances
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DOI：
10.1016/j.cattod.2011.04.012
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发表时间：
2011-10
期刊：
影响因子：
5.3
通讯作者：
T. Kamegawa;Norihiko Suzuki;K. Tsuji;Joji Sonoda;Yasutaka Kuwahara;K. Mori;H. Yamashita
中科院分区：
文献类型：
--
作者：
T. Kamegawa;Norihiko Suzuki;K. Tsuji;Joji Sonoda;Yasutaka Kuwahara;K. Mori;H. Yamashita
使用三乙氧基氟硅烷（TEFS）作为甲硅烷基化试剂对含有介孔二氧化硅（TiSBA-15）表面的单中心钛氧化物部分进行疏水改性。即使在这些表面进行改性后，TiSBA-15 的孔结构和高表面积仍得以保留。适量TEFS改性的TiSBA-15在以H2O2水溶液为氧化剂将环辛烯选择性氧化为1,2-环氧环辛烷时表现出比未改性TiSBA-15更高的催化性能。 TiSBA-15表面亲疏水性能的改善对于提高催化活性非常有效。
Hydrophobic modification of single-site Ti-oxide moieties containing mesoporous silica (TiSBA-15) surfaces was performed by using triethoxyfluorosilane (TEFS) as a silylation reagent. The pore structure as well as the high surface area of TiSBA-15 was retained even after modification of these surfaces. TiSBA-15 modified with suitable amount of TEFS exhibited higher catalytic performance for the selective oxidation of cyclooctene to 1,2-epoxy cyclooctane using aqueous H2O2as an oxidant than the unmodified TiSBA-15. The improvement of surface hydrophilic–hydrophobic properties of TiSBA-15 is quite effective for the enhancement of catalytic activity.