Efficient allylic oxidation of cyclohexene catalyzed by trimetallic hybrid nano-mixed oxide (Ru/Co/Ce)

Ghiaci, Mehran; Aghabarari, Behzad; Rego, A.M. Botelho do; Ferraria, Ana Maria; Habibollahi, Saeed

doi:10.1016/j.apcata.2010.12.006

Cited by 38 publications

(21 citation statements)

References 23 publications

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“…Ketone (2-cyclohexen-1-one) was always the main product (87 %). Using RuO 2 /Co 3 O 4 /CeO 2 nanoparticles as catalyst, M. Ghiaci et al 87 obtained the same results. A further increase in the molar ratio to 2 did not improve the reaction conversion or products selectivity.…”

Section: Article Rsc Advancesmentioning

confidence: 63%

Allylic oxidation of cyclohexene over ruthenium-doped titanium-pillared clay

et al. 2015

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ARTICLE This journal isRuthenium-doped H-Montmorillonite (H-Mont) and Ti-pillared clay (Ti-PILC) were prepared then studied for oxidation of cyclohexene, with tert-butylhydroperoxide (TBHP) as the oxygen source. The Ti-PILC support was prepared by hydrolysis of Ti(OC 3 H 7 ) 4 with HCl. The synthesized Ru/Ti-PILC and Ru/H-Mont catalysts were characterized by chemical analysis, surface area/pore volume measurements, Fourier transform infrared (FTIR) spectroscopy, Xray powder diffraction (XRD), and UV-vis-diffuse reflectance spectroscopy (UV-vis-DRS). Both catalysts can selectively oxidize cyclohexene through allylic oxidation to give 2cyclohexene-1-one as the major product, and 2-cyclohexene-1-ol as the minor product. The influence of reaction time, temperature, catalyst amount, and substrate/oxidant ratio was also investigated to find the optimal reaction for cyclohexene oxidation to get the highest conversion. Indeed, when the 5%Ru/Ti-PILC was employed as catalyst, 59 % of cyclohexene conversion, 87 % of selectivity for 2-cyclohexene-1-one and 13 % of selectivity for 2cyclohexene-1-ol were obtained under ambient pressure, at 70 °C, for a 6 h reaction time. The catalysts were reused in four consecutive runs.

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Section: Article Rsc Advancesmentioning

confidence: 63%

Allylic oxidation of cyclohexene over ruthenium-doped titanium-pillared clay

et al. 2015

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“…Trimetallic nanoparticles have shown improved catalytic performances relative to their mono-and bimetallic counterparts for a variety of reactions that include cyclohexene and glucose oxidation, the electrooxidation of formic acid, and C-C coupling [23][24][25][26]. It has been proposed that trimetallic systems may present distinct properties relative to their mono-and bimetallic counterparts, which enables, at least in principle, the design of nanomaterials with optimized performances [11,21,22,27,28].…”

Section: Introductionmentioning

confidence: 98%

Probing the catalytic activity of bimetallic versus trimetallic nanoshells

et al. 2015

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The synthesis of trimetallic nanoparticles represents an emerging strategy to maximize catalytic performances in noble metal-based catalysts. However, the controllable synthesis of trimetallic nanomaterials as well as the exact role played by the addition of a third metal in their composition over catalytic performances remains unclear. In this paper, we describe the synthesis of trimetallic nanoshells having AgAuPd, AgAuPt, and AgPdPt compositions by a sequential galvanic replacement reaction approach between Ag nanospheres as sacrificial templates and the corresponding metal precursors, i.e., AuCl 4 -(aq) , PdCl 4 2-(aq) , and/or PtCl 6 2-(aq) . In each of these systems, the composition could be systematically tuned by varying the molar ratios between Ag and each metal precursor. Nanoshells having Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 compositions were employed as model systems to investigate the effect of the addition of the third metal in their composition over the catalytic activities toward the 4-nitrophenol reduction. Our data demonstrate a significant enhancement in conversion percentages and thus the catalytic activities relative to the sum of their bimetallic counterparts, and this increase was dependent on the nature of the metals, corresponding to 826, 135, and 56 % for Ag 56 Au 28 Pd 16 , Ag 78 Au 9 Pt 13 , and Ag 71 Pd 16 Pt 13 nanoshells relative to their bimetallic analogs. The results presented herein demonstrate the strong correlation between catalytic activity and composition in multimetallic nanoshells, and that the incorporation of a third metal may represent a promising approach to boost catalytic activities for a variety of transformations.

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“…However, in the case of MEDPT@CP-bentonite-Au (0) catalyst by using 100 mg of the catalyst the conversion increased to some extent, but because of the low selectivity of the catalyst we did not bother to show more curiosity. We demonstrated in our previous work [13] that 1,2-dichloroethane is the best solvent for the reaction. Thus, using this solvent, conversion and selectivity to ketone reached 90% and 55%, respectively.…”

Section: Effect Of Amount Of Catalystmentioning

confidence: 97%

“…The silica-supported metal catalysts have advantages over the other heterogeneous catalysts, since they show excellent properties such as high stability (chemically and thermally), good accessibility, and also due to the fact that organic groups can be literally anchored to the surface to provide catalytic centers [9][10][11][12]. Herein, and in continuation of our previous works [13,14], we wish to report the activity of two new catalysts and compare their preference in this important reaction.…”

Section: Introductionmentioning

confidence: 99%