Catalytic properties of Co/Al2O3 system for hydrocarbon synthesis

Bechara, Rafeh; Balloy, David; Vanhove, Dominique

doi:10.1016/s0926-860x(00)00672-4

Cited by 128 publications

(43 citation statements)

References 52 publications

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“…Both the fresh and regenerated samples showed that the binding energy of Co 2p was 779.77 eV, indicating that the Co was present as Co 3 O 4 [43]. For the used sample, after a curve-fitting procedure was applied, the binding energy of 777.33 eV was observed clearly, which indicated the presence of metal cobalt [44]. This result is in agreement with the XRD analysis above.…”

Section: Catalyst Characterizationsupporting

confidence: 86%

Study on Alumina-Supported Cobalt–Nickel Oxide Catalyst for Synthesis of Acetonitrile from Ethanol

Cheng

Zhang

et al. 2010

Catal Lett

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A new alumina-supported cobalt-nickel oxide catalyst for the synthesis of acetonitrile from ethanol and ammonia was prepared by coprecipitation-kneading method. The parameters influencing the reaction were studied thoroughly and an optimized process, which is running the reaction at 380°C under atmospheric pressure while keeping the ammonia/alcohol molar ratio of 5 and GHSV of 1,163 h -1 , was obtained. Under the optimized conditions the catalyst reached its best performance when being on stream for 40 h, at which the yield of acetonitrile was 92.6%. Then the selectivity to acetonitrile decreased gradually but the yield of acetonitrile always remained higher than 81% within 720 h. The samples of the fresh and used catalyst were characterized by XRD, XPS, TEM, EDX and N 2 adsorption-desorption analysis. The results revealed that carbon deposition and formation of metal carbides from the active species in the catalytic runs led to the deterioration of the catalyst.

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Section: Catalyst Characterizationsupporting

confidence: 86%

Study on Alumina-Supported Cobalt–Nickel Oxide Catalyst for Synthesis of Acetonitrile from Ethanol

Cheng

Zhang

et al. 2010

Catal Lett

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“…The percentage conversion of carbon monoxide as a function of time is presented in Figure 7. The calculated À1 by Co exposed on the surface is the same order of magnitude as that observed in the FTS catalyzed by supported Co catalysts [21,22] or Ru catalysts in aqueous phase. [23] The FTS performed with the Co nanoparticles ((7.7 AE 1.2) nm or (4.5 AE 0.6) nm in size) dispersed in BMI·NTf 2 (see Experimental Section) under the same reaction conditions employed with the isolated nanoparticles yielded also hydrocarbons and oxygenates with the same selectivity.…”

supporting

confidence: 75%

Catalytic Gas‐to‐Liquid Processing Using Cobalt Nanoparticles Dispersed in Imidazolium Ionic Liquids

et al. 2008

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FT special report: Cobalt nanoparticles with a size of around 7.7 nm prepared in 1‐alkyl‐3‐methylimidazolium bis(trifluoromethanesulfonyl)imidate ionic liquids are effective catalysts for the Fischer–Tropsch (FT) synthesis, yielding olefins, oxygenates, and paraffins (C7–C30). The nanoparticles are easily prepared by the decomposition of [Co(CO)8] in the ionic liquid at 150 °C and can be reused at least three times if they are not exposed to air.

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“…However, the first peak was significantly shifted to higher temperature than that of the Co 3 O 4 /SiO 2 nanocomposites. This result could be attributed to the protective effects of porous silica shell which inhibited H 2 to diffuse along the porous channels to access Co 3 O 4 nanoparticles [27,28]. Moreover, the second peak was also gradually shifted to higher temperatures and this was attributed to the reduction of CoO to metallic Co 0 .…”

Section: Reducibility Of the Co 3 O 4 @P-sio 2 Nanocompositesmentioning

confidence: 96%

Controlled Preparation of Co3O4@porous-SiO2 Nanocomposites for Fischer–Tropsch Synthesis

et al. 2014

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Monodispersible Co 3 O 4 nanoparticles were prepared via a facile solvothermal route using polyvinylpyrrolidone (PVP) as capping agent and the porous silica shell was then coated by means of the Stöber process to fabricate Co 3 O 4 @porous-SiO 2 (Co 3 O 4 @p-SiO 2 ) nanocomposites. The particle size of Co 3 O 4 and porous silica shell thickness of Co 3 O 4 @p-SiO 2 nanocomposites could be easily controlled through changing the amount of PVP and tetraethoxysilane, respectively. The high resolution transmission electron microscopy results, together with the X-ray diffraction results, indicated that monodispersible Co 3 O 4 nanoparticles were successfully prepared and uniformly encapsulated by porous silica. During the growth of silica shell, the PVP was trapped and dispersed in the silica shell. As a result, the porous silica shell was obtained after burning off the PVP and a positive correlation existed between the Brunauer-Emmett-Teller surface area of the porous silica shell and quantity of PVP in the original Co 3 O 4 nanoparticles. Compared with the Co/SiO 2 reference catalyst, CO conversion of the Co@p-SiO 2 model catalyst was more stable and higher in a period of 240 h, and hydrocarbon selectivity towards C 5 -C 18 fraction was also higher than that of the Co/SiO 2 catalyst. The results of analysis for the Co@p-SiO 2 catalyst showed that core@shell structure could maintain high dispersion of Co particles so as to provide higher number of Co active sites, and enhance selectivity towards C 5 -C 18 fraction due to confined structure of porous channel in the silica shell.

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Catalytic properties of Co/Al2O3 system for hydrocarbon synthesis

Cited by 128 publications

References 52 publications

Study on Alumina-Supported Cobalt–Nickel Oxide Catalyst for Synthesis of Acetonitrile from Ethanol

Study on Alumina-Supported Cobalt–Nickel Oxide Catalyst for Synthesis of Acetonitrile from Ethanol

Catalytic Gas‐to‐Liquid Processing Using Cobalt Nanoparticles Dispersed in Imidazolium Ionic Liquids

Controlled Preparation of Co3O4@porous-SiO2 Nanocomposites for Fischer–Tropsch Synthesis

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