Supported cobalt oxide on MgO: Highly efficient catalysts for degradation of organic dyes in dilute solutions

Zhang, Wei; Tay, Hui Lin; Lim, Sze Sheng.; Wang, Yongsheng; Zhong, Ziyi; Xu, Rong

doi:10.1016/j.apcatb.2009.12.014

Cited by 257 publications

(73 citation statements)

References 35 publications

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“…They found the activity follows the order of Co/SiO 2 > Co/TiO 2 > Co/Al 2 O 3 , which is due to the different metal-support interaction. Zhang et al investigated MgO-, ZnO-, Al 2 O 3 -, ZrO 2 -, TiO 2 -and SBA-15-supported cobalt oxide with oxone for the degradation of organic dyes in dilute solutions [17]. They reported that Co/MgO showed the best activity, which can be attributed to basicity of the support and hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

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Solution combustion synthesis of Co oxide-based catalysts for phenol degradation in aqueous solution

Liang

Ting

Sun

et al. 2012

Journal of Colloid and Interface Science

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a b s t r a c tSolution combustion using urea as a fuel was employed to synthesise Co oxide and Al 2 O 3 -, SiO 2 -and TiO 2 -supported Co oxide catalysts. The catalysts were characterised using several techniques such as N 2 adsorption/desorption, XRD, FTIR, UV-vis diffuse reflectance and SEM-EDX, and their catalytic activity was evaluated in phenol degradation in aqueous solution with sulphate radicals. Solution combustion is a simple and effective method in preparation of supported Co catalysts. Co 3 O 4 was the major Co crystal phase in the samples prepared via the combustion synthesis. Bulk Co 3 O 4 particles were not effective in reaction, but supported Co oxides showed higher activity than unsupported Co oxide. The supports influenced Co dispersion and catalytic activity. Co/TiO 2 exhibited the highest activity, but it deactivated much faster than other two supported catalysts. Co/SiO 2 showed a comparable activity to Co/Al 2 O 3 and the best stability among the three Al 2 O 3 -, SiO 2 -and TiO 2 -supported Co catalysts.

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Section: Resultsmentioning

confidence: 99%

“…Therefore, heterogeneous Co-loading systems are required. Several investigations have been reported in using Co oxides [10,11], Co 2+ exchanged zeolites [12] or supported Co catalysts [2,[13][14][15][16][17]. It was found that supported Co oxides could show good activity and stability [2,13,15,17].…”

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis of Co oxide-based catalysts for phenol degradation in aqueous solution

Liang

Ting

Sun

et al. 2012

Journal of Colloid and Interface Science

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“…The results show that all Co/MgO catalysts exhibited a similar XPS O 1s spectra, in which two sub-peaks can be resolved at binding energy of~529.4 eV and~531.2 eV. The peak located at lower binding energy corresponds to the lattice oxygen O 2− (O lat ), and the one at higher binding energy can be assigned to O ads that includes the surface oxygen (O 2 2− or O − ) belonging to the defective oxide or hydroxyl-like group and weakly bonded oxygen species [49][50][51]. The ratio of O ads /(O lat + O ads ) on the Co/MgO samples is similar except for the 0.5%Co/MgO sample, as shown in Table 1.…”

Section: Co Laser Raman Spectroscopy (Lrs)mentioning

confidence: 99%

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

Wang

et al. 2017

Catalysts

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Abstract:A highly-efficient and stable MgO-supported Co (Co/MgO) catalyst was developed for the oxidation of cyclohexane with oxygen. The effects of the Co loading and support on the catalytic activity of the supported Co 3 O 4 catalyst were investigated. The results show that the Co supported on MgO presented excellent activity and stability. When the Co/MgO catalyst with the Co content of 0.2 wt % (0.2%Co/MgO) was used, 12.5% cyclohexane conversion and 74.7% selectivity to cyclohexanone and cyclohexanol (KA oil) were achieved under the reaction conditions of 0.5 MPa O 2 and 140 • C for 4 h. After being repeatedly used 10 times, its catalytic activity was hardly changed. Further research showed that the high catalytic performance of the 0.2%Co/MgO catalyst is attributed to its high oxygen-absorbing ability and the high ratio between the amount of weak and medium base sites with the help of the synergistic interaction between Co and MgO.

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“…The degradation by UV radiation and advanced oxidation processes [4][5][6][7][8] is an excellent alternative to treat Industrial effluents. Amongst the emerging technologies of removing aqueous contaminants, the application of potassium monopersulfate (Oxone) as oxidizing agent presents several advantages, besides, Oxone decomposition can be conducted in the presence of homogeneous catalysts [9], heterogeneous catalysts [10], UV radiation [11] or heat [12] leading to the formation of powerful sulfate and hydroxyl radicals…”

Section: Introductionmentioning

confidence: 99%

Sonochemical and Photochemical Degradation of Cresol Red by Potassium Monopersulfate (Oxone) in Aqueous Medium

Fassi¹

2017

Austin J Urol

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Supported cobalt oxide on MgO: Highly efficient catalysts for degradation of organic dyes in dilute solutions

Cited by 257 publications

References 35 publications

Solution combustion synthesis of Co oxide-based catalysts for phenol degradation in aqueous solution

Solution combustion synthesis of Co oxide-based catalysts for phenol degradation in aqueous solution

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

Sonochemical and Photochemical Degradation of Cresol Red by Potassium Monopersulfate (Oxone) in Aqueous Medium

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