Catalytic Removal of Toluene in Air over Co–Mn–Al Nano-oxides Synthesized by Hydrotalcite Route

Lamonier, Jean‐François; Boutoundou, Aimé-Brice; Gennequin, Cédric; Pérez-Zurita, M.J.; Siffert, Stéphane; Aboukaı̈s, Antoine

doi:10.1007/s10562-007-9196-4

Cited by 84 publications

(46 citation statements)

References 39 publications

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“…In addition, a CoMnO 3 phase of the rhombohedral ilmenitetype can be identified [34]. This rhombohedral phase is known to coexist with cubic and tetragonal Co-Mn oxides and may originate from the formation of Mn 4+ cations during calcination [21,25]. The Co-free Co0Mn3 catalyst probably consists of a tetragonal MnMn 2 O 4 spinel with additional Mg 2+ and Al 3+ ions in the lattice.…”

Section: Elemental Analysis N 2 Physisorption and Xray Diffractionmentioning

confidence: 99%

“…For example, Rao et al [19] synthesized CNTs from methane over reduced Mg 1-x Co x Al 2 O 4 (x = 0.1 -0.4) spinel catalysts with high yields and superior qualities. Co-and Mn-based mixed oxides were used in various catalytic reactions, such as the Fischer-Tropsch synthesis [20][21][22], the decomposition of nitrous oxide [23,24], and the oxidation of volatile organic compounds [25]. As an effective promoter, Mn can significantly enhance the performance of Co catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the synthesis of cobalt-based catalysts for the selective growth of multiwalled carbon nanotubes under industrially relevant conditions

Becker

Xia

Tessonnier

et al. 2011

Carbon

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A An industrially applicable cobalt-based catalyst was optimized for the production of multiwalled carbon nanotubes (CNTs) from ethene in a hot-wall reactor. A series of highly active Co-Mn-Al-Mg spinel-type oxides with systematically varied Co : Mn ratios was synthesized by precipitation and calcined at different temperatures. The addition of Mn drastically enhanced the catalytic activity of the Co nanoparticles resulting in an extraordinarily high CNT yield of up to 249 gCNT/gCat. All quaternary catalysts possessed an excellent selectivity towards the growth of CNTs. The detailed characterization of the obtained CNTs by electron microscopy, Raman spectroscopy and thermogravimetry demonstrated that a higher Mn content results in a narrower CNT diameter distribution, while the morphology of the CNTs and their oxidation resistance remains rather similar. The temperature-programmed reduction of the calcined precursors as well as in-situ X-ray absorption spectroscopy investigations during the growth revealed that the remarkable promoting effect of the Mn is due to the presence of monovalent Mn(II) oxide in the working catalyst, which enhances the catalytic activity of the metallic Co nanoparticles by strong metal-oxide interactions. The observed correlations between the added Mn promotor and the catalytic performance are of high relevance for the production of CNTs on an industrial scale.

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Section: Elemental Analysis N 2 Physisorption and Xray Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing the synthesis of cobalt-based catalysts for the selective growth of multiwalled carbon nanotubes under industrially relevant conditions

Becker

Xia

Tessonnier

et al. 2011

Carbon

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“…According to the XRD and Raman results, the predominant phase in the ACCoMn and CPCoMn oxides corresponds to the Mn3O4 phase, which is reduced to MnO at approximately 490 °C [24]. Figure 6 shows that this reduction process occurs at 480 and 450 °C for ACCoMn and CPCoMn, respectively, indicating that a lower temperature is required to carry out the Mn3O4 reduction in the solid synthesized by co-precipitation (CPCoMn).…”

Section: Redox Properties and Oxygen Mobilitymentioning

confidence: 98%

Oxygen Storage Capacity and Oxygen Mobility of Co-Mn-Mg-Al Mixed Oxides and Their Relation in the VOC Oxidation Reaction

2015

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Co-Mn-Mg-Al oxides were synthesized using auto-combustion and co-precipitation techniques. Constant ratios were maintained with (Co + Mn + Mg)/Al equal to 3.0, (Co + Mn)/Mg equal to 1.0 and Co/Mn equal to 0.5. The chemical and structural composition, redox properties, oxygen storage capacity and oxygen mobility were analyzed using X-ray fluorescence (XRF), X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), temperature-programmed reduction of hydrogen (H2-TPR), oxygen storage capacity (OSC), oxygen storage complete capacity (OSCC) and isotopic exchange, respectively. The catalytic behavior of the oxides was evaluated in the total oxidation of a mixture of 250 ppm toluene and 250 ppm 2-propanol. The synthesis methodology affected the crystallite size, redox properties, OSC and oxide oxygen mobility, which determined the catalytic behavior. The co-precipitation method got the most active oxide in the oxidation of the volatile organic compound (VOC) mixture because of the improved mobility of oxygen and ability to favor redox processes in the material structure.

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“…The layers contain metal cations of at least two different oxidation states [13,14]. Indeed, after calcination treatment, mixed oxides are formed and possess unique properties like high specific surface area and porosity, good thermal stability, good mixed oxides homogeneity basic properties and high metal dispersion [15][16][17][18][19]. The partial or total substitution of Mg 2+ and Al…”

Section: Open Accessmentioning

confidence: 99%

Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

et al. 2013

Self Cite

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X 6 Al 2 HT500 hydrotalcites, where X represents Mg, Fe, Cu or Zn were synthetized and investigated before and after gold deposition for toluene and CO total oxidation reactions. The samples have been characterized by specific areas, XRD measurements and Temperature Programmed Reduction. Concerning the toluene total oxidation, the best activity was obtained with Au/Cu 6 Al 2 HT500 catalyst with T 50 at 260 °C. However, catalytic behavior of Au/X 6 Al 2 HT500 sample in both reactions depends mainly on the nature of the support.

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Catalytic Removal of Toluene in Air over Co–Mn–Al Nano-oxides Synthesized by Hydrotalcite Route

Cited by 84 publications

References 39 publications

Optimizing the synthesis of cobalt-based catalysts for the selective growth of multiwalled carbon nanotubes under industrially relevant conditions

Optimizing the synthesis of cobalt-based catalysts for the selective growth of multiwalled carbon nanotubes under industrially relevant conditions

Oxygen Storage Capacity and Oxygen Mobility of Co-Mn-Mg-Al Mixed Oxides and Their Relation in the VOC Oxidation Reaction

Influence of Gold on Hydrotalcite-like Compound Catalysts for Toluene and CO Total Oxidation

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