High catalytic activity of palladium nanoparticle clusters supported on a spherical polymer network

Abstract

In this communication we report the synthesis of Pd nanoparticle clusters achieved via the assembly of Pd nanoparticles on the surface of a spherical polymer network. The network exhibits flexibility and adapts to the cluster formation. The nanoclusters display high catalytic activity toward p-nitrophenol reduction and the Suzuki-Miyaura coupling reaction.

Morphological Stability and Catalytic Performance of Supported and Unsupported Dendritic Gold Nanowire Catalysts

“…We examined the catalytic performance of Au DNWs and spherical Au NPs, using the reduction of p ‐nitrophenol to p ‐aminophenol by NaBH 4 . The reaction rate for this transformation can be easily determined by monitoring the characteristic UV‐vis intensities of p ‐nitrophenol and p ‐aminophenol at 400 and 300 nm, respectively (Figure a) . As shown in Figure b, the reaction did not proceed in the absence of Au, and the reactivity of the Au DNWs was higher than that of the spherical Au NPs.…”

“…As shown in Figure b, the reaction did not proceed in the absence of Au, and the reactivity of the Au DNWs was higher than that of the spherical Au NPs. As the NaBH 4 concentration was initially significantly higher than those of p ‐nitrophenol, pseudo‐first‐order rate constant k was evaluated using the equation − kt =ln ( C t / C 0 ), where k is the pseudo‐first‐order rate constant, and C t and C 0 represent the concentrations of p ‐nitrophenol at time t and the initial concentration at t =0, respectively . The k values for the Au DNWs and spherical Au NPs were 0.0129 and 0.0064 s −1 , respectively.…”

Highly active Pd–Ni nanocatalysts supported on multicharged polymer matrix

“…The composite with excess palladium, Pd3Ni1-pIJMVCA-co-St), is similar to the previously described Pd4-pIJMVCA-co-St). 28 It consists of particles with an average diameter of about 5 nm organized in flower-like clusters of 68-75 nm in size (Fig. 1C).…”

“…23 Pd-Ni nanowires exhibit high catalytic activity for the hydrogenation of 4-nitrophenol 24 and in the Suzuki-Miyaura coupling reaction. [25][26][27] Previously, 28 we reported Pd NPs clusters on a spherical polymeric matrix (pIJMVCA-co-St)). The matrix consisted of viologen-cavitands 29,30 interconnected with alkyl chains.…”

“…The clusters Pdn-pIJMVCA-co-St) exhibit high catalytic activity in reduction reactions and in the Suzuki-Miyaura reaction. 28 The coupling reaction proceeds under mild conditions: in water at room temperature. Continuing this work, we developed bimetallic Pd-Ni and monometallic Ni composites using pIJMVCA-co-St) as a supporting matrix.…”