Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue

New catalysts based on Pd(0) nanoparticles (Pd NPs) on a bimodal porous silica of the UVM-7/polydopamine (PDA) support have been synthesized following two preparative strategies based on the sequential or joint incorporation of two components of the composite (Pd and PDA). We analyzed the role playe...

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Bibliographic Details
Published inCatalysts Vol. 10; no. 4; p. 449
Main Authors Ródenas, Miguel, El Haskouri, Jamal, Ros-Lis, José Vicente, Marcos, M. Dolores, Amorós, Pedro, Úbeda, M. Ángeles, Pérez-Pla, Francisco
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.04.2020
Subjects
4-nitrophenol
bimodal porosity
Catalysis
Catalysts
Chemical reactions
Chemical synthesis
Dispersion
Entrapment
Graphene
Hydrogenation
Incorporation
mesoporous silica
Nanoparticles
Nitrophenol
Organic chemicals
Palladium
polydopamine
Polymerization
Reagents
Silicon dioxide
Substrates
Vibration
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Summary:New catalysts based on Pd(0) nanoparticles (Pd NPs) on a bimodal porous silica of the UVM-7/polydopamine (PDA) support have been synthesized following two preparative strategies based on the sequential or joint incorporation of two components of the composite (Pd and PDA). We analyzed the role played by the PDA as ‘interfacial glue’ between the silica scaffold and the Pd NPs. The catalysts were tested for the hydrogenation of 4-nitrophenol using (NEt4)BH4 as the hydrogenating agent. In addition to the palladium content, the characterization of the catalysts at the micro and nanoscale has highlighted the importance of different parameters, such as the size and dispersion of the Pd NPs, as well as their accessibility to the substrate (greater or lesser depending on their entrapment level in the PDA) on the catalytic efficiency. Staged sequential synthesis has led to better catalytic results. The most active Pd(0) centers seem to be Pd NPs of less than 1 nm on the PDA surface. The efficiency of the catalysts obtained is superior to that of similar materials without PDA. A comprehensive comparison has been made with other catalysts based on Pd NPs in a wide variety of supports. The TOF values achieved are among the best described in the literature.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal10040449