Iron–cobalt mixed oxide nanocatalysts: Heterogeneous peroxymonosulfate activation, cobalt leaching, and ferromagnetic properties for environmental applications

Yang, Qiujing; Choi, Hyeok; Al-Abed, Souhail R.; Dionysiou, Dionysios D.

doi:10.1016/j.apcatb.2008.10.013

Cited by 557 publications

(171 citation statements)

References 31 publications

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“…Peaks at 2θ values of 28°, 43°, and 57° are corresponding to that of Co3O4. While 44° and 66° peaks are corresponding to Al2O3 [21,22]. For 30%Fe-X%Ce/Al2O3 catalysts, crystal phases of Fe2O3, Al2O3, and CeO2 are detected as shown in Figure 4.…”

Section: Effect Of Reduction Temperaturementioning

confidence: 95%

“…The monometallic profile of 30%Co/Al2O3 has shown two peaks between 260 and 400 °C and between 410 and 750 °C. The TPR results have shown an interference between peaks observed for 30%Fe/Al2O3 and 30% Co/Al2O3 [21,22]. For mixed catalyst, 30%Fe-X%Co/Al2O3 catalyst profiles demonstrated a peak between 370 and 390 °C, which is attributed to the reduction of Fe2O3 to Fe3O4; while the broad signal observed between 500 °C and 730 °C represents a dual reduction mechanism starting with Co3O4 to Co slightly above 500 °C and Fe3O4 to Fe above 600 °C [13,[20][21][22].…”

Section: Catalyst Characterizationmentioning

confidence: 97%

“…The H2-TPR analysis was performed over 30%Fe/Al2O3 catalyst as a reference profile and over mixed catalysts (30%Fe-X%Ce/Al2O3 and 30%Fe-X%Co/Al2O3). As shown in Figure 1, monometallic 30%Fe/Al2O3 catalyst showed two peaks at 420 °C and a broad signal with a peak around 680 °C corresponding to conversion of Fe2O3 to Fe3O4 and reduction of Fe3O4 to Fe, respectively [13,[20][21][22]. The monometallic profile of 30%Co/Al2O3 has shown two peaks between 260 and 400 °C and between 410 and 750 °C.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…The TPR results have shown an interference between peaks observed for 30%Fe/Al2O3 and 30% Co/Al2O3 [21,22]. For mixed catalyst, 30%Fe-X%Co/Al2O3 catalyst profiles demonstrated a peak between 370 and 390 °C, which is attributed to the reduction of Fe2O3 to Fe3O4; while the broad signal observed between 500 °C and 730 °C represents a dual reduction mechanism starting with Co3O4 to Co slightly above 500 °C and Fe3O4 to Fe above 600 °C [13,[20][21][22]. The simultaneous reduction of Fe3O4 and Co3O4 indicates the possibility of an interaction between Fe and Co, as confirmed by the hydrogen chemisorption [13,15,21,22].…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

et al. 2016

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Abstract:Catalytic methane decomposition is studied in a fixed bed reactor. Two sets of bimetallic catalysts are employed, namely: 30%Fe-X%Ce/Al 2 O 3 and 30%Fe-X%Co/Al 2 O 3 , and compared with monometallic 30%Fe/Al 2 O 3 catalyst. The effect of promoting Fe with Ce and Co and reduction temperature are investigated. The results reveal that Ce addition has shown a negative impact on H 2 yield while a positive effect on H 2 yield and catalyst stability are observed with Co addition. In terms of number of moles of produced hydrogen per active sites, Fe/Al 2 O 3 has shown a higher number of moles of hydrogen compared to bimetallic catalysts. The catalyst reduced at 500˝C exhibits better activity as compared to the catalyst reduced at 950˝C. Carbon nano-tubes are deposited on the catalyst within the range of 14-73 nm diameter. Two types of carbon nanotubes are detected: Cα and Cγ.

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Section: Effect Of Reduction Temperaturementioning

confidence: 95%

Section: Catalyst Characterizationmentioning

confidence: 97%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

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Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

et al. 2016

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“…These results confirm that radical reactions on the BiOBr catalyst-water interface indeed dominated the CBZ degradation in peroxide/BiOX systems. [15], iron-cobalt mixed oxide [24] and Co3O4 [25]). Since adsorption (Figure 1a), direct oxidation by peroxides (Figure 1b), and leached bismuth ions (Text S4 and Figure S7, Supplementary Materials) make little contribution to CBZ degradation, the CBZ degradation decrease likely resulted from the attack of SO • and/or HO• generated from the activation of PMS by…”

Section: Stability Of Biobr As a Pms Activatormentioning

confidence: 99%

Efficient Degradation of Aqueous Carbamazepine by Bismuth Oxybromide-Activated Peroxide Oxidation

Zhang

Chu

et al. 2017

Catalysts

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Bismuth oxyhalide, usually employed as a photocatalyst, has not been tested as an activator of peroxide for water purification. This work explores the potential application of bismuth oxyhalide (BiOX, X = Cl, Br, I)-activated peroxide (H 2 O 2 ; peroxymonosulfate (PMS) and peroxydisulfate) systems for the degradation of carbamazepine (CBZ) in water destined for drinking water. BiOBr showed the highest activity toward the peroxides investigated, especially toward PMS. The most efficient combination, BiOBr/PMS, was selected to further research predominant species responsible for CBZ degradation and toxicity of transformation products. With repeated use of BiOBr, low bismuth-leaching and subtle changes in crystallinity and activity were observed. CBZ degradation was primarily (67.3%) attributable to attack by sulfate radical. Toxicity test and identification of the oxidation products indicated some toxic intermediates may be produced. A possible degradation pathway is proposed. Besides substitution of the hydroxyl groups on the surface of the catalyst particles, PMS's complexation with the lattice Bi(III) through ion exchange with interlayer bromide ion was involved in the decomposition of PMS. The Bi(III)-Bi(V)-Bi(III) redox cycle contributed to the efficient generation of sulfate radicals from the PMS. Our findings provide a simple and efficient process to produce powerful radicals from PMS for refractory pollutant removal.

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Reactive Inorganic Oxy‐Species of C, N, S, and P

Sharma¹

2012

Oxidation of Amino Acids, Peptides, and Proteins

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Iron–cobalt mixed oxide nanocatalysts: Heterogeneous peroxymonosulfate activation, cobalt leaching, and ferromagnetic properties for environmental applications

Cited by 557 publications

References 31 publications

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

Effect of Ce and Co Addition to Fe/Al2O3 for Catalytic Methane Decomposition

Efficient Degradation of Aqueous Carbamazepine by Bismuth Oxybromide-Activated Peroxide Oxidation

Reactive Inorganic Oxy‐Species of C, N, S, and P

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