Synthesis and characterization of cobalt-substituted SBA-15 and its high activity in epoxidation of styrene with molecular oxygen

Cui, Haitao; Zhang, Ye; Qiu, Zegang; Zhao, Lei; Zhu, Yulei

doi:10.1016/j.apcatb.2010.09.003

Cited by 90 publications

(23 citation statements)

References 37 publications

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“…IR spectra of cobalt-silicate 6a and Co 2 (CO) 6 -5-chloropentyne complex were compared in Figures 1 and 2, respectively. Both Co 2 (CO) 8 and Co 2 (CO) 6 -5-chloropentyne complexes display three stretching bands around 2000 cm ), which additionally support the formation of 6a, based on the reported data.…”

Section: Resultssupporting

confidence: 51%

“…Various techniques for the incorporation of cobalt catalyst into silicate have been reported; adsorption method, 5 wet impregnation method, 6 template-ion exchange, 7 and pH-adjusting method. 8 Each method is of practical advantage or disadvantage in usage particularly in acidic or basic medium and for the control of porosity. None of these processes, however, is satisfactory for non-localized dispersion of catalyst into porous support.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of the Surface Modified SBA-15 with Dicobaltcarbonyl Complex

Park¹,

Jeon²,

Jun³

et al. 2014

Bulletin of the Korean Chemical Society

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Cobalt-immobilized SBA-15 6a-c was synthesized from alkyne-attached SBA 5a-c by the reaction with Co 2 (CO) 8 in toluene. Alkyne group was introduced into amino SBA-15 (4) by imine-linkage or substitution with propargyl bromide to afford iminoalkyne 5a and aminoalkyne 5b, respectively. Meanwhile, alkyne 5c was prepared in one-step by reacting triethoxysilyl hexyne with SBA-15. Dicobalt-complexes 6a-c were characterized by means of FT-IR, solid-state NMR and elemental analysis.

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Section: Resultssupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of the Surface Modified SBA-15 with Dicobaltcarbonyl Complex

Park¹,

Jeon²,

Jun³

et al. 2014

Bulletin of the Korean Chemical Society

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“…However, previous studies had found that DMF was the best solvent in terms of the activity for the styrene oxidation [24,35], especially when oxygen was used as the oxidant [25,43,44]. This behavior may be associated with the high affinity of DMF to oxygen [44] or the coordination of DMF with Co sites to form the active sites [38].…”

Section: Effect Of Solvents On the Epoxidation Of Styrene With 10% Comentioning

confidence: 97%

“…Various supported Co catalysts, including Co 2+ -exchanged zeolites [23], Co-substituted mesoporous materials [24], cobalt supported on silica [25], and Co immobilized in metal organic framework [26] have been developed to enhance the epoxidation of alkene. Our group recently introduced Co into the mesoporous silica via the ultrasonic irradiation [27], and found that this novel catalyst had excellent styrene conversion and selectivity to benzaldehyde in the oxidation of styrene with hydrogen peroxide.…”

Section: Cobalt (Co) Is An Important Component For a Broad Range Of Cmentioning

confidence: 99%

Epoxidation of styrene using carbon nanotubes-supported cobalt catalysts

Jin

Zhu

et al. 2014

Inorganica Chimica Acta

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“…As shown inTable 1, both the unit cell parameter (a0) and the amount of Cu increases with increasing pH, which indicates that the copper species may be incorporated into the silica framework of SBA-15 because the bond length of Cu-O is longer than that of Si-O. However, the intensity of peak (100) of Cu-SBA-15 decreases with increasing pH, which indicates the loss of the long-range order for SBA-15[27]. The wide-angle XRD patterns of the Cu-SBA-15(x) are illustrated inFigure 1(b).…”

mentioning

confidence: 87%

Catalytic wet peroxide oxidation of aniline in wastewater using copper modified SBA-15 as catalyst

Kong

Zhou

Yao

et al. 2015

Environmental Technology

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SBA-15 mesoporous molecular sieves modified with copper (Cu-SBA-15) were prepared by pH-adjusting hydrothermal method and characterized by X-ray diffraction, BET, transmission electron microscopy, UV-Vis and (29)Si MAS NMR. The pH of the synthesis gel has a significant effect on the amount and the dispersion of copper on SBA-15. The Cu-SBA-15(4.5) (where 4.5 denotes the pH value of the synthesis gel) modified with highly dispersed copper was used as catalyst for the oxidation of aniline by H2O2. The Cu-SBA-15(4.5) shows a higher catalytic activity compared to CuO on the surface of SBA-15. The influences of reaction conditions, such as initial pH of the aqueous solutions, temperature, as well as the dosages of H2O2 and catalyst were investigated. Under weakly alkaline aqueous solution conditions, the aniline conversion, the H2O2 decomposition and the total organic carbon (TOC) removal could be increased significantly compared to the acid conditions. The percentage of leaching Cu(2+) could be decreased from 45.0% to 3.66% when the initial pH of solution was increased from 5 to 10. The TOC removal could be enhanced with the increases of temperature, H2O2 and catalyst dosage, but the aniline conversion and H2O2 decomposition change slightly with further increasing dosage of catalyst and H2O2. At 343 K and pH 8.0, 100% aniline conversion and 66.9% TOC removal can be achieved under the conditions of 1.0 g/L catalyst and 0.05 mol/L H2O2 after 180 min. Although copper might be slightly leached from catalyst, the homogeneous Cu(2+) contribution to the whole catalytic activity is unimportant, and the highly dispersed copper on SBA-15 plays a dominant role.

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Synthesis and characterization of cobalt-substituted SBA-15 and its high activity in epoxidation of styrene with molecular oxygen

Cited by 90 publications

References 37 publications

Synthesis and Characterization of the Surface Modified SBA-15 with Dicobaltcarbonyl Complex

Synthesis and Characterization of the Surface Modified SBA-15 with Dicobaltcarbonyl Complex

Epoxidation of styrene using carbon nanotubes-supported cobalt catalysts

Catalytic wet peroxide oxidation of aniline in wastewater using copper modified SBA-15 as catalyst

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