Mild oxidation of bulky organic compounds with hydrogen peroxide over mesoporous TiO2-SiO2 xerogels prepared by non-hydrolytic sol-gel
Mild oxidation of bulky organic compounds with hydrogen peroxide over mesoporous TiO2-SiO2 xerogels prepared by non-hydrolytic sol-gel
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DOI：
10.1016/j.apcatb.2010.04.027
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发表时间：
2010-06-18
影响因子：
22.1
通讯作者：
Hulea, Vasile
中科院分区：
文献类型：
--
作者：
Cojocariu, Ana Mihaela;Mutin, P. Hubert;Hulea, Vasile
本文首次报道了用非水解溶胶-凝胶法制备的TiO_2-SiO_2干凝胶催化剂在H_2O_2水溶液中对大体积有机物的氧化反应。蒽、环辛烯、苯乙烯、α-萘酚、二苯硫醚、二苯并噻吩和4，6-二甲基-二苯并噻吩在中等温度（40-60 ℃）下以高活性、选择性和H2 O2效率被氧化。此外，当使用叔丁基过氧化氢（TBHP）作为氧化剂时，观察到类似的催化行为。这些优异的催化性能归因于催化剂的独特结构（比表面积1200 m2·g-1，孔体积2.4 cm 3·g-1，平均孔径15 nm）和暴露于H2 O2或TBHP水溶液后Ti位点的稳定性。(C)2010爱思唯尔有限公司版权所有。
The oxidation of bulky organic compounds with aqueous H2O2 over a TiO2-SiO2 xerogel catalyst prepared by a simple non-hydrolytic sol-gel route is described for the first time. Anthracene, cyclooctene, styrene, alpha-naphtol, diphenyl sulfide, dibenzothiophene and 4,6-dimethyl-dibenzothiophene were oxidized with high activity, selectivity and H2O2 efficiency at moderate temperatures (40-60 degrees C). Moreover, a similar catalytic behavior was observed when tert-butyl hydroperoxide (TBHP) was used as an oxidizing agent. These excellent catalytic performances were ascribed to the unique texture of the catalyst(specific surface area 1200 m(2) g(-1), pore volume 2.4 cm(3) g(-1), average pore diameter 15 nm) and to the stability of Ti sites after exposure to aqueous H2O2 or TBHP. (C) 2010 Elsevier B.V. All rights reserved.