Characterization and catalytic activity of cobalt containing MCM-41 prepared by direct hydrothermal, grafting and immobilization methods

Bhoware, Shrikant S.; Singh, Anand

doi:10.1016/j.molcata.2006.09.031

Cited by 73 publications

(30 citation statements)

References 48 publications

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“…Nonionic triblock copolymer surfactant EO 20 PO 70 EO 20 (P123, Aldrich) was used as the structure-directing agent. Concentrated aqueous HCl solution was used as the acid source.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis of mesoporous Co/Ce-SBA-15 materials and their catalytic performance in the catalytic oxidation of benzene

Tian

et al. 2008

Materials Research Bulletin

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Cerium-containing SBA-15 mesoporous materials, with different Ce/Si molar ratios, were synthesized by a direct hydrothermal synthesis method and further modified by impregnation with 10, 15 and 20 wt.% Co. Characterizations by powder X-ray diffraction (XRD), N 2 sorption, inductively coupled plasma (ICP) and UV-vis spectroscopy were carried out. The small-angle XRD and N 2 sorption characterizations showed that these Co supported materials have less-ordered mesoporous structures with partial blockage of pores, and their specific surface area, pore volume and pore size were relatively lower than those of unsupported ceriumcontaining SBA-15. Spinel Co 3 O 4 constituted the predominant cobalt phase in the prepared catalysts, and CeO 2 was also detected. All the Co supported catalysts exhibited high catalytic activity in the oxidation of benzene. #

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“…Nonionic triblock copolymer surfactant EO 20 PO 70 EO 20 (P123, Aldrich) was used as the structure-directing agent. Concentrated aqueous HCl solution was used as the acid source.…”

Section: Methodsmentioning

confidence: 99%

“…11.6-11.8 nm) is larger than that of 8Ce-SBA-15 (11.42 nm). This may be ascribed to the partial incorporation of cobalt into the framework of 8Ce-SBA-15 [20].…”

Section: Methodsmentioning

confidence: 99%

Synthesis of mesoporous Co/Ce-SBA-15 materials and their catalytic performance in the catalytic oxidation of benzene

Tian

et al. 2008

Materials Research Bulletin

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“…Meanwhile, Co/MCM-41 shows peaks at 2h = 36.8, 44.8, 59.3 and 65.2 characteristic of Co3O 4 nano-particles which have a mean size of 9 ± 3 nm. Since it is known that some cations can form clusters in highly alkaline conditions [16], the presence of oxides in our samples is the result of the synthesis procedure. In the case of the TiO 2 loaded samples (Fig.…”

Section: Catalytic Experimentsmentioning

confidence: 99%

“…However, it is notable that those maxima corresponding to Cr 6? overlap, resulting in a unique [16,30,[37][38][39][40]. In the case of the TiO 2 /Co/ MCM-41 sample, the absorption feature in the visible region is very similar to that of the Co/MCM-41 sample, showing no evidence of heterojunction between titania species and transition metal.…”

Section: Samplementioning

confidence: 99%

Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves

et al. 2011

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MCM-41 materials were modified with Cr, Fe, Co and Ti by the wet impregnation method. Various techniques including ICP, XRD, N 2 adsorption, UV-Vis DRS and TPR were employed for the catalysts characterization. The Acid Orange 7 (AO7) degradation in aqueous solution was studied over the synthesized photocatalyst under UV-Vis and visible radiation. The Cr modified catalysts exhibited the major activity under UV and visible light. Particularly, the Cr/MCM-41 sample reached a dye degradation of around 81% in visible light, being the Cr 6? species primarily responsible for this photoactivity. Upon the loading of TiO 2 , the searched heterojunction effect between chromium and titania species was not observed.

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“…Different preparation methods were reported for cobalt oxide nanoparticles embedded in a silica matrix such as sol-gel (Santos et al, 2012;Cantalini et al, 2005), hydrothermal (Kogelbauer et al, 1995;Bhoware and Singh, 2007), grafting, immobilization (Bhoware and Singh, 2007) and direct solution impregnation (Ming and Baker, 1995) methods. Among all of these techniques, sol-gel is considered as the most effective one producing mesoporous structures and fine particles (Cantalini et al, 2005;Fouad et al, 2011;Santos et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties of Cobalt Oxide/Silica Nanocomposites Obtained by Sol-Gel Technique

Ali¹,

Fouad²,

Makhlouf³

2016

American Journal of Engineering and Applied Sciences

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Abstract:This work is an extension of our previous studies on cobalt oxide nanoparticles impeded in a silica matrix. Here we study the preparation and characterization of high cobalt content materials (60-90 wt%). In addition, the DC electrical conductivity of the prepared materials in a wide temperature range (350-673 K) was measured and discussed. The activation energy has been obtained according to Mott's Small-Polaron Hopping (SPH) and Mott's and Greaves Variable Range Hopping (VRH) models.

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Characterization and catalytic activity of cobalt containing MCM-41 prepared by direct hydrothermal, grafting and immobilization methods

Cited by 73 publications

References 48 publications

Synthesis of mesoporous Co/Ce-SBA-15 materials and their catalytic performance in the catalytic oxidation of benzene

Synthesis of mesoporous Co/Ce-SBA-15 materials and their catalytic performance in the catalytic oxidation of benzene

Synthesis and Photocatalytic Activity of Titania-Loaded Transition Metal-Modified MCM-41 Molecular Sieves

Electrical Properties of Cobalt Oxide/Silica Nanocomposites Obtained by Sol-Gel Technique

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