نتایج جستجو برای ' Ruthenium '

 In liquid phase hydrogenation of benzene, Ru–Zn(2.8%) catalyst (Ru–Zn catalyst with the Zn mass percentage of 2.8%) exhibited the excellent selectivity to cyclohexene for the nano-size effect and the chemisorbed ZnSO4·3(ZnOH)2⋅7H2O salt formed by the promoter ZnO reacting with ZnSO4. It is found that the cyclohexene yield of Ru–Zn(2.8%) catalyst generally increased with the molecular weight of PEG (Polyethylene glycol) in the presence of ZnSO4. PEG-10000 (Poly...

 A fibrous bacterial biosorbent was developed to bind precious metal–organic complexes in batch and column processes. Polyethylenimine (PEI)-modified bacterial biosorbent fiber (PBBF) was prepared by spinning Corynebacterium glutamicum biomass-chitosan blends, coating them with PEI and cross-linking with glutaraldehyde. When an acetic acid waste solution containing 1822.9 mg/L Ru was used as a model waste solution, Ru uptake by the PBBF was 16.5 times higher than that o...

 A simple route is demonstrated for the efficient immobilization of silica with l-(N-α-acetylphenylalanine)–ruthenium(III) complex. This catalyst was labelled as RHAPhe–Ru. The 29Si MAS NMR showed the presence of T3, T2, Q3 and Q4 silicon centers. The 13C MAS NMR showed the presence of three chemical shifts consistent with the three carbon atoms of the propyl group. The catalytic performance of RHAPhe–Ru was tested in the esterification of et...

 Chlorido-bridged chain complexes of dinuclear ruthenium benzoate analogues, [Ru2{3,4,5-(C mH2m+1O)3C6H2CO2}4Cl] n (mCl) (m = 3, 5–7, 9, 11, 13, 15, 17), were synthesised and the crystal structure of 3Cl · 2nH2O was revealed. The magnetic measurements for a series of the complexesmCl (m = 2–18) revealed that all the complexes show an antiferromagnetic interaction between the dinuclear unit, with a fastener effect giving the stronger interaction as...

 The increasing need for shifting to renewable feedstocks in the chemical industry has driven research toward using green aerobic, selective oxidation reactions to produce bulk chemicals. Here, we report the use of a ruthenium mixed oxide/hydroxide (RuOx) on different support materials for the selective aerobic oxidation of ethanol to acetic acid. The RuOx was deposited onto different oxide supports using a new gas-phase reaction, which in all cases resulted in homogeneous nanoparticul...

 Various mesoporous silica materials (FSM-16, HMS, SBA-15) aluminated via direct procedure or by a post-synthesis treatment, differing in the manner of Al distribution between the external surface and the mesoporous network, were employed for the immobilization of [(η5-MeC5H4)Ru(η3-DPVP)(η1-DPVP)]+(DPVP = PPh2CHCH2) complex. The catalysts of similar loading (ca. 5 wt.%) of Ru-species were prepared by means of cation exchange. The samples were characterized with XR...

  The activity of Ru catalyst on a new class of NiO modified TiO2 support, Ru/(NiO–TiO2), was studied in the liquid phase catalytic hydrogenation of xylose to xylitol. The TiO2 support was modified by simple impregnation method using nickel chloride precursor and subsequent oxidation. Various catalysts with different targeted compositions of Ru (1.0 and 5.0 wt%) and NiO (1.0, 5.0 and 10 wt%) in NiO–TiO2 were prepared. These catalysts were characterized by using energy dispe...

 A series of ruthenium complexes (RuCl3 × 3H2O, [C5H5Ru(CH3CN)3]+[PF6]−, [RuCl2(PPh3)3], [RuHCl(CO)(PPh3)3], [RuHCl(CO)(PCy3)2]) immobilized in [bmim][Tf2N] were tested in homocoupling of vinylsilanes (H2CCHSi(OEt)3, H2CCHSi(OiPr)3, H2CCHSi(OSiMe3)3, H2CCHSiMe(OSiMe3)2, and H2CCHSiPh(OSiMe3)2) performed in a biphasic system. The highest catalytic activity and selectivity of homocoupling product was observed for [RuHCl(CO)(PCy3)2]. The complex [RuHCl(CO)(PCy3)2] immobil...

 A combination of bentonite-TiO2 was used as support to enhance the activity of Ru/TiO2 catalyst in hydrogenolysis of aqueous glycerol to 1,2-propanediol. A series of bentonite, TiO2, SiO2 and Al2O3supported Ru catalyst were fabricated and characterized by XRD, XPS, BET, FESEM-EDX and TEM to establish some physicochemical properties of the catalysts. The activity of the catalysts was tested in glycerol hydrogenolysis reaction and were found to be in the following increasing o...

 A Ru-Sn-Co/AlO(OH) catalyst was prepared by co-impregnation, calcination, and hydrothermal reduction. The catalyst was well characterized by BET, XRD, SEM-EDX, XPS, H2-TPR, and Mössbauer spectroscopy, and then it was applied in the hydrogenation of dimethyl adipate to 1,6-hexanodiol in aqueous phase. It was found that the addition of cobalt could stabilize Sn(IV) and the cooperation between tin and cobalt could promote the reduction of ruthenium oxide. The γ-Al2O3 in the ca...