Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral

Kouachi, K.; Lafaye, Gwendoline; Especel, Catherine; Cherifi, O.; Marécot, P.

doi:10.1016/j.molcata.2009.04.001

Cited by 14 publications

(12 citation statements)

References 26 publications

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“…By comparison, in our previous work, the highly dispersed nanosphere could not be obtained with the normal operation of blending two microemulsions before adding a silicon source [38]. A similar situation also happened during the preparation of silica-supported cobalt materials [30,31]. As pointed out by Boutonnet et al, there are two main ways of preparing nanoparticles from the microemulsion method: (1) by mixing two microemulsions, one containing the precursor and the other, the precipitating agent; and (2) by adding the precipitating agent directly to the microemulsion containing the metal precursor [26].…”

Section: Resultsmentioning

confidence: 90%

Facile preparation of highly-dispersed cobalt-silicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation

et al. 2011

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Highly dispersed cobalt-silicon mixed oxide [Co-SiO2] nanosphere was successfully prepared with a modified reverse-phase microemulsion method. This material was characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform infrared, ultraviolet-visible diffuse reflectance spectra, X-ray absorption spectroscopy near-edge structure, and N2 adsorption-desorption measurements. High valence state cobalt could be easily obtained without calcination, which is fascinating for the catalytic application for its strong oxidation ability. In the selective oxidation of cyclohexane, Co-SiO2 acted as an efficient catalyst, and good activity could be obtained under mild conditions.

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Section: Resultsmentioning

confidence: 90%

Facile preparation of highly-dispersed cobalt-silicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation

et al. 2011

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“…To successfully achieve this, a rational choice of the support materials as well as a good strategy for placing the active catalysts on the support materials are required. Many heterogeneous catalysts are often prepared by immobilizing well prepared homogeneous catalysts onto an insoluble solid support such as polymers, − zeolite, − or silica . Although there are some examples of iron-containing heterogeneous catalysts based on silica gel, polymeric support, , and metal organic framework (Fe-MOF) for epoxide ring-opening reactions, these have randomly ordered pores in the case of silica gel, less robust structure in the case of polymer support, or small pore sizes in the case of Fe-MOF.…”

Section: Introductionmentioning

confidence: 99%

Epoxide Ring-Opening Reactions with Mesoporous Silica-Supported Fe(III) Catalysts

Das

Asefa

2011

ACS Catal.

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A mesoporous silica-supported iron(III) catalyst was successfully synthesized by tethering ethylenediamine ligands onto the mesopore channel walls of mesoporous silica and then using the diamine groups to support Fe(III) ions. The resulting material is shown to be an efficient catalyst for the ring-opening of various epoxides by a series of alcohols as well as water under mild reaction conditions giving good-to-high yields of the corresponding ring-opened products. Among the alcohols tested with styrene oxide substrate giving 2-alkoxy-2-phenylethanol products, MeOH was the most reactive. It gave the highest percent conversion and yield (∼100%) within a relatively short reaction time of 6 h, whereas the longer alkyl alcohols gave a relatively lower yield of 93 to ∼100% with longer reaction times of 9−56 h. When the alkyl groups of the linear alkyl alcohols were longer, the rates of the catalytic reaction were slower. For instance, EtOH gave ∼100% yield in 9 h, but n-PrOH produced 93% product in 45 h. Substituted alkyl alcohols produced only 9−62% product in even longer reaction times of 72−144 h, with the more substituted alcohols giving the slower reaction rates. The catalyst was also shown to ring-open other epoxides, such as chloropropylene oxide and 2-methyl-1,2-epoxypropane. The chloropropylene oxide was found to react much more slowly than the 2-methyl-1,2-epoxypropane, whereas the 2-methyl-1,2-epoxypropane underwent catalytic reaction slightly more slowly than styrene oxide in the presence of the catalyst under the same reaction conditions. The catalyst was shown to be reusable multiple times without leaching of the Fe(III) ions.

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“…3 illustrates the H 2 -TPD profiles of the Co-Z-350 and CoCu-Z-T samples. In the H 2 -TPD profiles of the Co-Z-350, there are three overlapped desorption peaks locating at 88°C, 123°C and 170°C in the low temperature range (LT), corresponding to different H-Co sites [24]. After Cu doped, the shoulder peak at 88°C vanished, and the intensity of other desorption peaks in the LT range became weaker, indicating that the weakest H-Co sites disappeared and less active Co sites exposed in the CoCu-Z-350 sample, which may be due to partial Co sites being blocked/covered by large crystalline Cu [12].…”

Section: Hydrogen Adsorption Properties Of Catalystsmentioning

confidence: 99%

Highly active and selective CoCu/ZnO catalysts prepared by mild oxalic acid co-precipitation method in dimethyl oxalate hydrogenation

Kong

Zhang

Chen

2015

Catalysis Communications

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Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral

Cited by 14 publications

References 26 publications

Facile preparation of highly-dispersed cobalt-silicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation

Facile preparation of highly-dispersed cobalt-silicon mixed oxide nanosphere and its catalytic application in cyclohexane selective oxidation

Epoxide Ring-Opening Reactions with Mesoporous Silica-Supported Fe(III) Catalysts

Highly active and selective CoCu/ZnO catalysts prepared by mild oxalic acid co-precipitation method in dimethyl oxalate hydrogenation

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