Полимер-стабилизированные наночастицы рутения как катализаторы селективного окисления D-глюкозы

Physicochemical and catalytic properties of Ru nanoparticles stabilized in HPS matrix were investigated. Ru nanoparticles with diameter of 1.2 nm, which reveal high stability, activity and selectivity (up to 99.8% at 99.5% conversion) in reaction of D-glucose oxidation, are obtained.Исследованы физико-химические и каталитические свойства Ru - содержащих наночастиц диаметром 1.2 нм, стабилизированных в матрице сверхсшитого полистирола. Полученные нанокомпозиты проявляют высокую стабильность, активность и селективность (до 99.8% при 99.5%-ной конверсии) в реакции окисления D-глюкозы

Polymer-stabilized ruthenium nanoparticles as the catalysts of selective <i>D</i>-glucose oxidation.

Physicochemical and catalytic properties of Ru nanoparticles stabilized in HPS matrix were investigated. Ru nanoparticles with diameter of 1.2 nm, which reveal high stability, activity and selectivity (up to 99.8% at 99.5% conversion) in reaction of D-glucose oxidation, are obtained

Mono- and Bimetallic Nanoparticles Stabilized by an Aromatic Polymeric Network for a Suzuki Cross-Coupling Reaction

This work addresses the Suzuki cross-coupling between 4-bromoanisole (BrAn) and phenylboronic acid (PBA) in an environmentally benign ethanol&ndash;water solvent catalysed by mono- (Pd) and bimetallic (PdAu, PdCu, PdZn) nanoparticles (NPs) stabilised within hyper-cross-linked polystyrene (HPS) bearing tertiary amino groups. Small Pd NPs of about 2 nm in diameters were formed and stabilized by HPS independently in the presence of other metals. High catalytic activity and complete conversion of BrAn was attained at low Pd loading. Introduction of Zn to the catalyst composition resulted in the formation of Pd/Zn/ZnO NPs, which demonstrated nearly double activity as compared to Pd/HPS. Bimetallic core-shell PdAu/HPS samples were 3-fold more active as compared to Pd/HPS. Both Pd/HPS and PdAu/HPS samples revealed promising stability confirmed by catalyst recycling in repeated reaction runs

Ru@hyperbranched Polymer for Hydrogenation of Levulinic Acid to Gamma-Valerolactone: The Role of the Catalyst Support

Hydrogenation of levulinic acid (LA) obtained from cellulose biomass is a promising path for production of &gamma;-valerolactone (GVL)&mdash;a component of biofuel. In this work, we developed Ru nanoparticle containing nanocomposites based on hyperbranched pyridylphenylene polymer, serving as multiligand and stabilizing matrix. The functionalization of the nanocomposite with sulfuric acid significantly enhances the activity of the catalyst in the selective hydrogenation of LA to GVL and allows the reaction to proceed under mild reaction conditions (100 &deg;C, 2 MPa of H2) in water and low catalyst loading (0.016 mol.%) with a quantitative yield of GVL and selectivity up to 100%. The catalysts were successfully reused four times without a significant loss of activity. A comprehensive physicochemical characterization of the catalysts allowed us to assess structure-property relationships and to uncover an important role of the polymeric support in the efficient GVL synthesis