Role of polyaniline morphology in Pd particles dispersion. Hydrogenation of alkynes in the presence of Pd-polyaniline catalysts
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Robert Kosydar
,
Monika Goral
Abstract
Two polyaniline (PANI) samples of various molecular masses were used for the preparation of palladium catalysts (with 2 mass % of Pd). The physicochemical features of starting polyanilines were found to substantially affect the size and extent of palladium nanoparticles aggregation. Strongly aggregated large palladium particles appeared in the PANI sample of more compact morphology (PANI-H), higher crystallinity and lower specific surface area. Pd nanoparticles of a definitively smaller size were formed in the more amorphous PANI sample of looser morphology (PANI-L) and the extent of particles aggregation was markedly lower. The catalytic properties of Pd/PANI samples were studied in a liquid phase hydrogenation of unsaturated triple bond (C≡C) in alkynes reactants, phenylacetylene, and cyclohexylacetylene. The 2 mass % Pd/PANI-L catalyst prepared using polymer of less compact texture exhibited much higher activity in both reactions. In the presence of the 2 mass % Pd/PANI-L catalyst, alkene products were formed with a high selectivity (approximately 90 %) attained at the almost complete conversion of alkynes. This highly selective hydrogenation of the C≡C to the C=C bond was related to the presence of an electroactive polymer, PANI, in close proximity with Pd active sites. Polyaniline could have a role in a steric effect as well as in a modification of adsorptive properties of Pd centres.
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© 2013 Institute of Chemistry, Slovak Academy of Sciences
Artikel in diesem Heft
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Artikel in diesem Heft
- Recent trends and progress in research into structure and properties of polyaniline and polypyrrole — Topical Issue
- Printing polyaniline for sensor applications
- Carbonised polyaniline and polypyrrole: towards advanced nitrogen-containing carbon materials
- Conducting polymer-silver composites
- Electrorheological response of polyaniline and its hybrids
- Effect of PPy/PEG conducting polymer film on electrochemical performance of LiFePO4 cathode material for Li-ion batteries
- Polyaniline micro-/nanostructures: morphology control and formation mechanism exploration
- Self-assembly of aniline oligomers and their induced polyaniline supra-molecular structures
- Self-organization of polyaniline during oxidative polymerization: formation of granular structure
- Influence of ethanol on the chain-ordering of carbonised polyaniline
- X-ray absorption spectroscopy of nanostructured polyanilines
- Effect of cations on polyaniline morphology
- Preparation of polyaniline in the presence of polymeric sulfonic acids mixtures: the role of intermolecular interactions between polyacids
- Chemical degradation of polyaniline by reaction with Fenton’s reagent — a spectroelectrochemical study
- Thin mesoporous polyaniline films manifesting a water-promoted photovoltaic effect
- Polyamide grafted with polypyrrole: formation, properties, and stability
- Effect of ionic liquid on polyaniline chemically synthesised under falling-pH conditions
- Polyaniline doped with poly(acrylamidomethylpropanesulphonic acid): electrochemical behaviour and conductive properties in neutral solutions
- Electrical transport properties of poly(aniline-co-p-phenylenediamine) and its composites with incorporated silver particles
- Bi-hybrid coatings: polyaniline-montmorillonite filler in organic-inorganic polymer matrix
- Preparation of aqueous polyaniline-vesicle suspensions with class III peroxidases. Comparison between horseradish peroxidase isoenzyme C and soybean peroxidase
- Preparation, characterisation, and dielectric properties of polypyrrole-clay composites
- Multi-wall carbon nanotubes with nitrogen-containing carbon coating
- Conducting poly(o-anisidine)-coated steel electrodes for supercapacitors
- Conducting polyaniline/multi-wall carbon nanotubes composite paints on low carbon steel for corrosion protection: electrochemical investigations
- Preparation of a miniaturised iodide ion selective sensor using polypyrrole and pencil lead: effect of double-coating, electropolymerisation time, and current density
- Role of polyaniline morphology in Pd particles dispersion. Hydrogenation of alkynes in the presence of Pd-polyaniline catalysts
- Nanostructured polyaniline-coated anode for improving microbial fuel cell power output
- Antibacterial properties of polyaniline-silver films
- Effect of compression pressure on mechanical and electrical properties of polyaniline pellets
