Synthesis of Pd@graphene oxide framework nanocatalyst with enhanced activity in Heck‐Mizoroki cross‐coupling reaction. (18th May 2020)

• Record Type: Journal Article
• Authors: Shekarizadeh, Arezoo; Azadi, Roya
• Is Part Of: Applied organometallic chemistry. Volume 34:Number 9(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-05-18
• Subjects: graphene oxide frameworks -- Heck reaction -- heterogeneous catalyst -- palladium nanoparticles; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.5775
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : A new method was developed for producing a catalyst involving a Pd nanoparticle (NP) embedded in a graphene oxide framework (Pd@GOF) with ordered macro‐ and mesoporous structures. First, 5, 5′‐diamino‐2, 2′‐bipyridine was selected as cross‐linking for covalent modification of GO nanosheets to prepare a three‐dimensional (3D) framework with interlayer spaces in which well‐dispersed and ultra‐small Pd NPs in situ grew and embedded the framework. The synthesized nanopores 3D Pd@GOF can act as nanoreactors to help the reaction substrates thoroughly come into contact with the surface of Pd NPs, thereby exhibiting high activity toward the Heck reaction, rarely reported concerning Pd NPs supported on one‐side functionalized graphene. The Pd@GOF catalyst can be used 10 times without any significant loss in the catalytic activity, confirming the long‐term stability of this catalyst. Therefore, the covalently assembled GOF was proposed as a universal platform for hosting noble metal NPs to construct the desired metal@GOF nanocatalyst with improved activity and stability that can be used in a broad range of practical applications. Abstract : GOF was successfully prepared by cross‐linking5, 5′‐diamino‐2, 2′‐bipyridine with GO as well‐defined porous support in heterogeneous catalysis. In situ dispersed Pd NPs were grown and encapsulated in the framework. The synthesized nanopores 3D Pd@GOF catalyst exhibited a superior performance toward the Heck cross‐coupling reaction. Also, the formed ordered pores were considered as nanoreactors to increase the contact area between the substrate and the catalyst.