Three dimensional composites of graphene as supports in Pd-catalyzed synthetic applications†,Reaction Chemistry & Engineering

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Three dimensional composites of graphene as supports in Pd-catalyzed synthetic applications†
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2018-11-07 00:00:00 , DOI: 10.1039/c8re00185e
Yuan Yang _{1,

2,

3,

4,

5} , Stanly E. Gilliland _{1,

2,

3,

4,

5} , Sajjad Ghobadi _{1,

2,

3,

4,

5} , Michael Burkholder _{1,

2,

3,

4,

5} , Sarah E. Smith _{1,

2,

3,

4,

5} , B. Frank Gupton _{1,

2,

3,

4,

5} , Carlos E. Castano _{2,

3,

4,

5,

6}

Affiliation

The graphitic one-dimensional carbon nanotube (CNT) and two-dimensional graphene (G) are important support materials in heterogeneous catalysis. However, the production of highly active but stable and recyclable catalysts using these materials is still challenging. In this work, through a facile and solventless method, a 3D composite was prepared by growing multiwall CNTs on G nanoplatelets through the Ni-catalyzed “tip growth” mechanism using a combination of ball milling and microwave irradiation steps. The advantageous high surface area provided by the atomically thin sheet of G and the aspect ratio of the CNT are combined to retain and enhance the mechanical, electronic, thermal, and catalytic properties. The resulting 3D Ni–graphene–carbon nanotube hybrid (NiGCNT) material exhibits magnetic properties and the unique 3D structure prevents graphene sheet restacking facilitating better catalyst recyclability and longevity. The exceptional catalytic properties provided by this 3D NiGCNT support loaded with Pd nanoparticles were demonstrated and tested in both Suzuki cross-coupling and C–H activation reactions. The Pd–NiGCNT was 10 times more active than commercially available Pd on activated carbon catalysts.

中文翻译：

石墨烯的三维复合材料在Pd催化的合成应用中作为载体†

石墨一维碳纳米管（CNT）和二维石墨烯（G）是非均相催化的重要载体材料。然而，使用这些材料生产高活性但稳定和可回收的催化剂仍然具有挑战性。在这项工作中，通过一种简便且无溶剂的方法，通过球磨和微波辐照步骤相结合的Ni催化的“尖端生长”机制，通过在G纳米片上生长多壁CNT制备了3D复合材料。由G原子薄板提供的有利的高表面积和CNT的纵横比结合在一起，可以保留并增强机械，电子，热和催化性能。最终的3D Ni-石墨烯-碳纳米管杂化材料（NiGCNT）具有磁性，独特的3D结构可防止石墨烯片重新堆叠，从而提高催化剂的可回收性和寿命。载有Pd纳米颗粒的3D NiGCNT载体提供了出色的催化性能，并在Suzuki交叉偶联和CH活化反应中进行了测试。在活性炭催化剂上，Pd–NiGCNT的活性是市售Pd的10倍。

更新日期：2018-11-07

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