Peroxotungstate immobilized on ionic liquid-modified silica as a heterogeneous epoxidation catalyst with hydrogen peroxide.
Peroxotungstate immobilized on ionic liquid-modified silica as a heterogeneous epoxidation catalyst with hydrogen peroxide.
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DOI：
10.1021/ja043688e
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发表时间：
2005-01
影响因子：
15
通讯作者：
K. Yamaguchi;Chie Yoshida;S. Uchida;N. Mizuno
中科院分区：
文献类型：
--
作者：
K. Yamaguchi;Chie Yoshida;S. Uchida;N. Mizuno
固定在离子液体改性 SiO2 上的过氧钨酸盐能够对多种烯烃进行非均相环氧化，同时保持均相类似物的催化活性。通过除去催化剂，环氧化立即停止，除去催化剂后的滤液中没有发现钨物质。这些结果可以排除浸入反应溶液中的钨物质对所观察到的催化作用的任何贡献，并且所观察到的催化本质上是真正异质的。此外，该催化剂可重复使用而不会损失催化性能。
Peroxotungstate immobilized on ionic liquid-modified SiO2 is capable of heterogeneously epoxidizing a wide range of olefins with the maintenance of the catalytic activity of homogeneous analogue. The epoxidation was immediately stopped by the removal of the catalyst, and no tungsten species could be found in the filtrate after the removal of the catalyst. These results can rule out any contribution to the observed catalysis from the tungsten species that leached into the reaction solution, and the observed catalysis is truly heterogeneous in nature. Furthermore, the catalyst was reusable without the loss of the catalytic performance.