Abstract

A series of novel bimetallic organic framework materials (Cu_x-Co_y-MOF) have been successfully prepared by a simple one-pot synthetic method, and their characters were evaluated via means of various techniques. The tested data showed a series of Cu_x-Co_y-MOFs displayed good crystallinity and the doping of Co in original Cu-based framework would not change the morphology of the MOF catalysts. The catalytic activity of prepared materials was tested in the catalytic oxidation of styrene in the presence of TBHP. The effects of reaction time, reaction temperature and other reaction conditions on catalytic performance were systematically studied. The results revealed that the introduction of Co can improve the selectivity to form epoxides and reduce the yield of benzaldehyde without affecting the conversion rate of catalytic oxidation reaction of styrene. Excitingly, the Cu_0.25-Co_0.75-MOF showed better catalytic performance than Cu-MOF and Co-MOF under the optimal reaction conditions, the conversion rate of styrene reached 97.81%, and styrene oxide selectivity reached 83.04%, which indicated a significant synergistic effect of the Cu/Co bimetallic MOF. Furthermore, the Cu_0.25-Co_0.75-MOF catalyst exhibited good reusability that could be reused at least four times without significant inactivation.

Graphic abstract

A series of novel bimetallic organic framework materials (Cu_x-Co_y-MOF) have been successfully prepared via a simple one-pot synthetic method, and they exhibited high activity and selectivity as catalyst towards for oxidation of styrene.

中文翻译：

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一锅合成双金属MOF作为苯乙烯选择性氧化的高效催化剂

摘要

通过简单的一锅合成方法成功制备了一系列新型的双金属有机骨架材料（Cu _x -Co _y -MOF ），并通过各种技术对其性能进行了评估。测试数据显示一系列Cu _x -Co _y-MOF表现出良好的结晶度，并且在原始的基于铜的骨架中掺杂Co不会改变MOF催化剂的形态。在TBHP存在下，在苯乙烯的催化氧化中测试了所制备材料的催化活性。系统研究了反应时间，反应温度和其他反应条件对催化性能的影响。结果表明，Co的引入可以提高形成环氧化物的选择性，降低苯甲醛的收率，而不会影响苯乙烯催化氧化反应的转化率。令人兴奋的是，Cu _0.25 -Co _0.75-MOF在最佳反应条件下表现出比Cu-MOF和Co-MOF更好的催化性能，苯乙烯的转化率达到97.81％，氧化苯乙烯的选择性达到83.04％，表明Cu / Co双金属MOF具有明显的协同作用。此外，Cu _0.25 -Co _0.75 -MOF催化剂表现出良好的可重复使用性，可以重复使用至少四次而不会发生明显的失活。

图形摘要

通过一种简单的一锅合成方法成功地制备了一系列新型的双金属有机骨架材料（Cu _x -Co _y -MOF ），并且它们具有很高的活性和选择性，可以催化苯乙烯氧化。