Synthesis and Immobilization of Metal Nanoparticles Using Photoactive Polymer‐Decorated Zeolite L Crystals and Their Application in Catalysis
Synthesis and Immobilization of Metal Nanoparticles Using Photoactive Polymer‐Decorated Zeolite L Crystals and Their Application in Catalysis
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DOI：
10.1002/adsc.202000208
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发表时间：
2020-05
影响因子：
5.4
通讯作者：
M. Wissing;Maximilian H. Niehues;B. Ravoo;A. Studer
中科院分区：
文献类型：
--
作者：
M. Wissing;Maximilian H. Niehues;B. Ravoo;A. Studer
介绍了一种在L型分子筛表面制备Au和Pd纳米粒子的方法。这种方法中使用的聚合物具有双重作用：在紫外光照射下，它们在Norrish‐I型反应中释放高度还原的酮基自由基。这些自由基用作一种电子供体以将金属盐还原成相应的金属NP。同时，聚合物壳稳定了原位生成的金属纳米颗粒。 结果表明，沸石-聚合物-NP复合物可用作苄醇氧化为醛和炔立体选择性半氢化为Z-烯烃的可回收催化剂。这些混合催化剂中的聚合物壳保护NP免于聚集，并且还改变它们的催化性质。
A facile route to generate Au and Pd nanoparticles (NPs) on zeolite L crystals decorated with photoactive polymer brushes is described. The polymers used in this approach serve a dual role: Upon irradiation with UV light, they release highly reducing ketyl radicals in a Norrish‐Type‐I reaction. These radicals serve as one electron donors to reduce metal salts to the corresponding metal NPs. At the same time the polymer shell stabilizes thein situgenerated metal NPs. It is shown that the zeolite‐polymer‐NP composites can be used as recyclable catalysts for the oxidation of benzylic alcohols to aldehydes and the stereoselective semihydrogenation of alkynes toZ‐alkenes. The polymer shell in these hybrid catalysts protects the NPs from aggregation and also alters their catalytic properties.