Metal Supported on Dendronized Magnetic Nanoparticles: Highly Selective Hydroformylation Catalysts

Centre for Catalysis Research and Innovation, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5.
Journal of the American Chemical Society (Impact Factor: 12.11). 05/2006; 128(15):5279-82. DOI: 10.1021/ja060140u
Source: PubMed


A method for homogenizing heterogeneous catalyst is described. The method is based on growing polyaminoamido (PAMAM) dendrons on silica-coated magnetic nanoparticles. After the dendronizing process, the silica-coated magnetic nanoparticles are more stable and more soluble in organic solvents. The dendronized particles are phosphonated, complexed with [Rh(COD)Cl]2, and applied in catalytic hydroformylation reactions. These new catalysts are proven to be highly selective and reactive.

Download full-text


Available from: Raed Abu-Reziq, Oct 05, 2015
53 Reads
  • Source
    • "Thus, protection of surface of the nanoparticle is of great importance in order to minimize the attractive forces between particles. A range of protection strategies were reported, including metal inorganic coating [8], organic/functional group [9] and polymer/surfactant coating [10] [11]. Among all of these, surface protection using surfactants were extensively investigated because of its suitability and ease in providing active surface functionality towards different target ligands. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, novel surfactant-coated magnetic nanoparticles were synthesized and evaluated for enrichment performance towards the sensitive detection of disease biomarkers. Surfactants with phosphate ester groups (RD35A and RD66) were used as a coating to reduce aggregation and to enhance the nanoparticle dispersion. Importantly, sensitive enrichment of the target proteins using the antibody-functionalized magnetic nanoparticles (Ab@MNP) was obtained, with a five-fold increase in recovery compared to uncoated magnetic nanoparticles. Similarly, phosphopeptide enrichment using the NTA@MNP in standard samples showed that the nanoparticles could selectively enrich phosphorylated peptides.
    IOP Conference Series Materials Science and Engineering 08/2014; 64(1):012022. DOI:10.1088/1757-899X/64/1/012022
  • Source
    • "In recent years, the rapid development of versatile synthetic strategies for magnetic materials with controlled size, composition, and structure opens enormous possibilities for the preparation of heterogeneous or heterogenized homogeneous catalysts with magnetic properties45678910. Irrespective of these impressive advances, it is surprising that the application of the magnetic catalysts is very primitive, i.e., their magnetic properties were only lavishly used to help in their separation111213141516. The question arises and remains to be answered: is it possible to extract additional benefits from the magnetism of these elaborately designed magnetic catalysts? "
    [Show abstract] [Hide abstract]
    ABSTRACT: The application of elaborately designed magnetic catalysts has long been limited to ease their separation from the products only. In this paper, we for the first time employed a magnetic sulphonated poly(styrene-divinylbenzene) resin catalyst on a magnetically stabilized-bed (MSB) reactor to enhance the etherification of fluidized catalytic cracking (FCC) light gasoline, one of the most important reactions in petroleum refining industry. We demonstrated that the catalytic performance of the magnetic acid resin catalyst on the magnetic reactor is substantially enhanced as compared to its performance on a conventional fixed-bed reactor under otherwise identical operation conditions. The magnetic catalyst has the potential to be loaded and unloaded continuously on the magnetic reactor, which will greatly simplify the current complex industrial etherification processes.
    Scientific Reports 06/2013; 3:1973. DOI:10.1038/srep01973 · 5.58 Impact Factor
  • Source
    • "Magnetic nanoparticles have been extensively utilized in the recovery of metal ions and dyes, magnetic bioseparation, targeted therapy, drug delivery, and biological detection and imaging because magnetic separation technique possesses the advantages of rapidity, high efficiency, and cost-effectiveness [3-7]. Also, they have been shown to be highly efficient as supports in heterogeneous catalytic reactions owing to their high specific surface area and magnetically recoverability [8]. On the other hand, Au nanoparticles not only exhibit unique optical and catalytic properties but also have excellent chemical stability and biocompatibility. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A novel magnetically recoverable Au nanocatalyst was fabricated by spontaneous green synthesis of Au nanoparticles on the surface of gum arabic-modified Fe3O4 nanoparticles. A layer of Au nanoparticles with thickness of about 2 nm was deposited on the surface of gum arabic-modified Fe3O4 nanoparticles, because gum arabic acted as a reducing agent and a stabilizing agent simultaneously. The resultant magnetically recoverable Au nanocatalyst exhibited good catalytic activity for the reduction of 4-nitrophenol with sodium borohydride. The rate constants evaluated in terms of pseudo-first-order kinetic model increased with increase in the amount of Au nanocatalyst or decrease in the initial concentration of 4-nitrophenol. The kinetic data suggested that this catalytic reaction was diffusion-controlled, owing to the presence of gum arabic layer. In addition, this nanocatalyst exhibited good stability. Its activity had no significant decrease after five recycles. This work is useful for the development and application of magnetically recoverable Au nanocatalyst on the basis of green chemistry principles.
    Nanoscale Research Letters 06/2012; 7(1):317. DOI:10.1186/1556-276X-7-317 · 2.78 Impact Factor
Show more