The nano-Al2O3-promoted epoxidation of alkenes with molecular oxygen as the oxidant has been developed, providing an efficient route to a variety of epoxides in moderate to excellent yields. The environmentally friendly and efficient nano-Al2O3 catalyst could be easily recovered and reused five times without significant loss of activity.

中文翻译：

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在纳米Al2O3存在下以分子氧为氧化剂环氧化烯烃

已经开发出以分子氧为氧化剂的纳米 Al2O3 促进的烯烃环氧化反应，以中等至优异的产率提供了多种环氧化物的有效途径。环保高效的纳米Al2O3催化剂可以很容易地回收和重复使用5次，而不会显着降低活性。