Zeolite confined nanostructured dinuclear ruthenium clusters: preparation, characterization and catalytic properties in the aerobic oxidation of alcohols under mild conditions

Date

2009-01-01

Author

Zahmakiran, Mehmet
Özkar, Saim

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

80
views

0
downloads

Zeolite confined nanostructured dinuclear ruthenium clusters as a novel material were prepared by a simple three step procedure: (i) the ion-exchange of Ru3+ ions with the extra-framework Na+ ions in zeolite-Y, (ii) reduction of the Ru3+ ions within the cavities of zeolite with borohydride ions in aqueous solution all at room temperature, (iii) drying the isolated samples under aerobic conditions at 100 +/- 1.0 degrees C. The composition, morphology and structure of zeolite confined nanostructured dinuclear ruthenium clusters, as well as the integrity and crystallinity of the host material, were investigated by using ICP-OES, XRD, XPS, SEM, TEM, HRTEM, TEM/EDX, Raman, FTIR, Ru K-edge XANES, EXAFS spectroscopies, and N-2-adsorption/desorption technique. The results of these multi-pronged analyses reveal the formation of nanostructured dinuclear ruthenium clusters within the cavities of zeolite-Y, in which each ruthenium center exists in the oxidation state of 3+ and is surrounded by one oxygen of the zeolite framework and three hydroxyl ligands, without causing alteration of the framework lattice, mesopore formation, or loss of crystallinity of the host material. The catalytic use of zeolite confined nanostructured dinuclear ruthenium(III) clusters was tested in the aerobic oxidation of activated, unactivated and heteroatom containing alcohols to carbonyl compounds and found to provide exceptional catalytic activity and selectivity under mild conditions (80 degrees C and 1 atm O-2 or air).

Subject Keywords

Materials Chemistry, General Chemistry

URI

https://hdl.handle.net/11511/62561

Journal

JOURNAL OF MATERIALS CHEMISTRY

DOI

https://doi.org/10.1039/b910766e

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Germanium determination by flame atomic absorption spectrometry: An increased vapor pressure-chloride generation system Kaya, Murat; Volkan, Mürvet (Elsevier BV, 2011-03-15) A new chloride generation system was designed for the direct, sensitive, rapid and accurate determination of the total germanium in complex matrices. It was aimed to improve the detection limit of chloride generation technique by increasing the vapor pressure of germanium tetrachloride (GeCl4). In order to do so, a novel joint vapor production and gas-liquid separation unit equipped with a home-made oven was incorporated to an ordinary nitrous oxide-acetylene flame atomic absorption spectrometer. Several va...
Thermal activation energy of crystal and amorphous nano-silicon in SiO2 matrix Wang, Jiwei; Righini, Marcofabio; Gnoli, Andrea; Foss, Steinar; Finstad, Terje; Serincan, Ugur; Turan, Raşit (Elsevier BV, 2008-09-01) Temperature and size dependence of photoluminescence (PL) of nano-silicon embedded in SiO2 matrix samples were studied. In these measurements, four samples with deferent implantation dose showed their similar tendency. Their nano-structure was investigated by high resolution electron microscopy (HREM) and selected area diffraction (SAD) which confirmed that only those prepared with the higher Si implantation dose formed crystal nano-silicon. The further analysis of the dependence of thermal activation energ...
Nano structural metal composites : synthesis, structural and thermal characterization Kaleli, Kadir; Kayran İşçi, Ceyhan; Department of Chemistry (2008) In this work , metal functional polymers, namely Cr-PS-b-P2VP, Co-PS-b-P2VP, Au-PS-b-P2VP, Fe-PS-b-P2VP and Mo-PS-b-P2VP were prepared by thermal reaction of hexacarbonylchromium, Cr(CO)6, octacarbonyldicobalt,Co2(CO)8, hydrogentetrachloroaurate(III), H(AuCl4).4H2O, trichloroiron(III), FeCl3.6H2O, molybdenum(VI)oxide, MoO3 and PS-b-P2VP. TEM images indicated formation of AuIII, Cr and Co nanoparticles. On the other hand, crystalline structures were detected for Fe-PS-b-P2VP and Mo-PS-b-P2VP. Samples involvi...
Behaviour of bimetallic Pt-Pd carbon-supported catalysts in methanol electrooxidation Gokagac, G; Leger, JM; Hahn, F (Walter de Gruyter GmbH, 2003-05-01) Carbon powder supported bimetallic 8w%Pt+8w%Pd/C, 8w%Pt+6w%Pd/C, 8w%Pt+4w%Pd/C, Sw%Pt+2w%Pd/C, 8w%Pt/C and 8w%Pd/C samples were prepared, characterised and tested for the electrooxidation of methanol. The particle sizes were found to depend greatly on the composition and the metal content. With pure palladium and samples rich in palladium, the diameter of the bimetallic particles was around 150 nm, but with pure Pt and samples poor in Pd it was much smaller, below 5 nm. The electrocatalytic activity of thes...
Phase transition of chemically synthesized FePt nanoparticles under high pressure ŞİMŞEK, TELEM; Karci, Ozgur; ÖZCAN, ŞADAN (The Scientific and Technological Research Council of Turkey, 2018-01-01) We present the results of a study related to phase transformation of chemically synthesized FePt nanoparticles under high pressure from face-centered cubic into face-centered tetragonal structure. As-synthesized nanoparticles are around 4.5 nm and show superparamagnetic behavior at 300 K. After annealing under 60 bar pressure of hydrogen at 400 degrees C for 2 h, nanoparticles exhibit strong ferromagnetic behavior with 5391 Oe coercivity. Results show that high-pressure annealing lowers the decomposition te...

Citation Formats

M. Zahmakiran and S. Özkar, “Zeolite confined nanostructured dinuclear ruthenium clusters: preparation, characterization and catalytic properties in the aerobic oxidation of alcohols under mild conditions,” JOURNAL OF MATERIALS CHEMISTRY, pp. 7112–7118, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62561.