Modification of Co–Mn–Al mixed oxide with potassium and its effect on deep oxidation of VOC

Jirátová, Květa; Mikulová, J.; Klempa, Jan; Grygar, Tomáš Matys; Bastl, Zdeněk; Kovanda, František

doi:10.1016/j.apcata.2009.04.004

Cited by 168 publications

(77 citation statements)

References 58 publications

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“…[43] The presence of the reduction peak at a higher temperature of approximately 637 8C in the TPR profiles of MnCo-MO catalysts (Figure 4) is additional evidence of the formation of mixed Co-Mn oxides. [4] After reduction of single (Co 3 O 4 and Mn 3 O 4 ) and mixed metal oxides (MnCo-MO) to the corresponding metallic forms during TPR experiments, TPO experiments were also performed and the results are displayed in Figure 5.…”

Section: Resultsmentioning

confidence: 93%

Mixed Co–Mn Oxide‐Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base‐Free Conditions

Jha

Patil²,

Rode

2013

ChemPlusChem

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Manganese‐doped cobalt mixed oxide (MnCo‐MO) catalyst was prepared by a solvothermal method. The as‐prepared catalyst was characterised by X‐ray photoelectron spectroscopy, H2 temperature‐programmed reduction, O2 temperature‐programmed oxidation and XRD. This catalyst gave 62 % conversion with 83 % selectivity to vanillin in 2 hours for the liquid‐phase air oxidation of vanillyl alcohol without using base. Three different types of metal oxides were observed in the prepared catalyst, which could be identified as Co3O4, Mn3O4 and CoMn2O4. Among these, the tetragonal phase of CoMn2O4 was found to be more active and selective for vanillyl alcohol oxidation than Co3O4 and Mn3O4. High‐resolution TEM characterisation revealed the morphology of MnCo‐MO nanorods with a particle size of 10 nm. Successful recycling of the catalyst was also established in this oxidation reaction.

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Section: Resultsmentioning

confidence: 93%

Mixed Co–Mn Oxide‐Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base‐Free Conditions

Jha

Patil²,

Rode

2013

ChemPlusChem

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“…After exposing to methane, Fe2p 3/2 peak widens and shake-up satellite decreases, which indicates that surface Fe 3 þ species gain electron and gradually reduce to Fe 2 þ with methane (Gao et al, 2013). The O1s XPS peaks at 529.0 is attributed to lattice oxygen in perovskite oxide (metaloxygen bond), while 531.1 and 532.4 eV are assigned to weakly bound oxygen on the surface (O 2 species that are molecularly adsorbed in the subsurface regions of oxygen-deficient perovskitetype compounds) or/and to the surface hydroxyls (Jirátová et al, 2009).…”

Section: Materials Characterizationmentioning

confidence: 99%

Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

Dai

Cheng

et al. 2016

Chemical Engineering Science

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“…These observations were inspiration for the present study. Similarly to report of Jirátová et al [15] mentioned above, the hydrotalcite-like materials were used as precursors of mixed metal oxide catalysts for VOCs incineration. Thermal treatment of such precursors results in nanocrystalline materials with homogenously distributed active components.…”

Section: Introductionmentioning

confidence: 99%

“…The Co 3 O 4 oxide was identified as the most catalytically active phase in the studied process. Jirátová et al [15] studied total oxidation of toluene and ethanol over the hydrotalcite-derived Co-Mn-Al mixed oxide catalyst (Co:Mn:Al molar ratio of 4:1:1) modified with various amounts of potassium (0-3 mass%). The CoMn-Al mixed oxide showed very good catalytic performance in the studied processes and addition of low amounts of potassium promoter additionally activated mixed metal oxide catalyst mainly by modification of the surface acid-base properties.…”

Section: Introductionmentioning

confidence: 99%

Hydrotalcite-derived Co-containing mixed metal oxide catalysts for methanol incineration

Basąg

Kovanda

Piwowarska

et al. 2017

J Therm Anal Calorim

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The Co-Mg-Al mixed metal oxides were prepared by calcination of co-precipitated hydrotalcite-like precursors at various temperatures (600-800°C), characterised with respect to chemical (AAS) and phase (XRD) composition, textural parameters (BET), form and aggregation of cobalt species (UV-vis-DRS) and their redox properties (H 2 -TPR, cyclic voltammetry). Moreover, the process of thermal decomposition of hydrotalcite-like materials to mixed metal oxide systems was studied by thermogravimetric method combined with the analysis of gaseous decomposition products by mass spectrometry. Calcined hydrotalcite-like materials were tested as catalysts for methanol incineration. Catalytic performance of the oxides depended on cobalt content, Mg/Al ratio and calcination temperature. The catalysts with lower cobalt content, higher Mg/Al ratio and calcined at lower temperatures (600 or 700°C) were less effective in the process of methanol incineration. In a series of the studied catalysts, the best results, with respect to high catalytic activity and selectivity to CO 2 , were obtained for the mixed oxide with Co:Mg:Al molar ratio of 10:57:33 calcined at 800°C. High activity of this catalyst was likely connected with the presence of a Co-Mg-Al spinel-type phases, containing easy reducible Co 3? cations, formed during high-temperature treatment of the hydrotalcite-like precursor.

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Modification of Co–Mn–Al mixed oxide with potassium and its effect on deep oxidation of VOC

Cited by 168 publications

References 58 publications

Mixed Co–Mn Oxide‐Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base‐Free Conditions

Mixed Co–Mn Oxide‐Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base‐Free Conditions

Reduction kinetics of lanthanum ferrite perovskite for the production of synthesis gas by chemical-looping methane reforming

Hydrotalcite-derived Co-containing mixed metal oxide catalysts for methanol incineration

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