Solvothermally derived Co3O4@m-SiO2 nanocomposites for Fischer–Tropsch synthesis

Xie, Rongyong; Li, Debao; Hou, Bo; Wang, Jungang; Jia, Litao; Sun, Yuhan

doi:10.1016/j.catcom.2010.10.010

Cited by 64 publications

(58 citation statements)

References 22 publications

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“…It can be clearly observed that the conventional catalysts showed higher amounts of heavy hydrocarbons formation, whereas for core−shell catalysts, the hydrocarbon selectivity spectrum shifted toward the middle distillate region. Similarly, when the activity and selectivity of reported catalyst are compared, conversion and C 5+ selectivity of 20Co 3 O 4 @MSN-1.5 at 230°C are higher by 10.3% and 11.2% respectively than the core−shell catalysis results reported by Xie et al 18 even though GHSV of our study was two times faster. Especially, our catalyst showed more advanced selectivity controlling capability and the C 19+ /C 5 −C 18 value in our case was 0.16 with respect to theirs value of 0.32.…”

Section: Resultscontrasting

confidence: 57%

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Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

et al. 2014

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A series of core−shell cobalt oxide catalysts were prepared by tuning the pore diameter of mesoporous silica shell and the influence of pore dimensions on Fischer− Tropsch synthesis was studied. TEM images of core−shell 20Co 3 O 4 @MSN-x catalysts showed an increase in the silica shell porosity with increasing molar ratio of the swelling agent to tetraethyl orthosilicate used during catalyst preparation. As a result of this porosity increase, the dispersion of congregated core Co oxide particles within the shell increased, resulting in multiple core centers. Reference catalysts were synthesized using conventional supports, and the effects of pore dimensions on the activity and hydrocarbon selectivity of the reference and the prepared core−shell catalysts were compared. In the experiments performed, 20Co 3 O 4 @MSN-x catalysts showed an increase in their CO conversion and C 5+ selectivity with increasing silica shell porosity. Moreover, the prepared core−shell catalysts demonstrated higher selectivity toward C5−C18 hydrocarbon fractions than SBA−15-and SiO 2 -supported Co oxide catalysts. This could be due to the comparatively lower diffusion limitations and less probability of readsorption of intermediates in the confined space of the mesoporous silica shell. Further, the core−shell catalysts displayed higher stability (100 h on stream) than the reference catalysts, and this was attributed to their small diffusion length and less probability of metal sintering due to a protective silica shell around Co oxide particles.

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Section: Resultscontrasting

confidence: 57%

“…16 In another study, a Au@SiO 2 framework of core−shell nanoparticles was used for the catalytic reduction of p-nitrophenol. 17 Xie et al 18 reported a solvothermally prepared Co 3 O 4 @m-SiO 2 core−shell catalyst for FT synthesis.…”

Section: Introductionmentioning

confidence: 99%

Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

et al. 2014

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“…Thus the peak g can be assigned to the reduction of NiO strongly interacted with SiO 2 species [43]. Also, compared with the conventional supported Ni catalyst [23], the peak a in Ce0-NiO-SiO 2 -350 catalyst is broader and located at higher temperature, which may be related to the protection of coreeshell structure [44]. After addition of CeO 2 (5%e10%), one new H 2 -TPR signal (peak b) appeared, with the maxima at around 470 C, while the peak a shifts to lower temperature, and the peak g shifts to higher temperature.…”

Section: Resultsmentioning

confidence: 95%

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

Zhang

Ren

et al. 2015

International Journal of Hydrogen Energy

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“…As reported previously, the Co 3 O 4 nanoparticles with different particle size could be prepared via solvothermal route using PVP as stabilizer [16]. Since the major contribution of surface area and porous structures results from PVP, it is therefore necessary to correlate the quantity of PVP in the reacting system with final specific surface area of Co 3 O 4 @p-SiO 2 nanocomposites.…”

Section: Synthesis and Characterization Of Co 3 O 4 @P-sio 2 Nanocompmentioning

confidence: 99%

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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Solvothermally derived Co3O4@m-SiO2 nanocomposites for Fischer–Tropsch synthesis

Cited by 64 publications

References 22 publications

Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

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

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Solvothermally derived Co3O4@m-SiO2 nanocomposites for Fischer–Tropsch synthesis

Cited by 64 publications

References 22 publications

Co3O4@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

Co3O4@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

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

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Product

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Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell

Co₃O₄@Mesoporous Silica for Fischer–Tropsch Synthesis: Core–Shell Catalysts with Multiple Core Assembly and Different Pore Diameters of Shell