An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study
A series of Mn–Ce(M) solids (M = K or Na), with molar ratios 100–0, 50–50 and 0–100 were prepared by co-precipitation of manganese and cerium nitrate from NaOH or KOH solutions at pH = 11. In addition, part of the solids precipitated with NaOH were dried and impregnated with a Cu²⁺ salt. The solids...
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| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2012
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/136851 |
| Aporte de: |
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I19-R120-10915-136851 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química Mn–Ce composite Phenol oxidation Phenolate Carboxylate Monodentate phenoxy group |
| spellingShingle |
Ciencias Exactas Química Mn–Ce composite Phenol oxidation Phenolate Carboxylate Monodentate phenoxy group D'Alessandro, Oriana Thomas, Horacio Jorge Sambeth, Jorge Enrique An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| topic_facet |
Ciencias Exactas Química Mn–Ce composite Phenol oxidation Phenolate Carboxylate Monodentate phenoxy group |
| description |
A series of Mn–Ce(M) solids (M = K or Na), with molar ratios 100–0, 50–50 and 0–100 were prepared by co-precipitation of manganese and cerium nitrate from NaOH or KOH solutions at pH = 11. In addition, part of the solids precipitated with NaOH were dried and impregnated with a Cu²⁺ salt. The solids were characterized by XRD, Specific Surface Area, XPS and EDS. The characterization analyses show the formation of Mn mixed oxides with different oxidation states (Mn³⁺, Mn⁴⁺), for samples without Ce or Mn–Ce(M) 50–50. In the latter solid and in the one where there is no Mn, the formation of CeO₂ (fluorite type) was detected. The samples were tested in the phenol removal in water at 100 °C and at atmospheric pressure with the aim to analyze the adsorbed species in the first stage of the adsorption-oxidation mechanisms. The results indicate, on the one hand, that [MnOₓ] is the active species in the process and that the most active solids are those that present (i) a higher concentration of O<sub>I</sub>, (ii) a higher amount of Mn⁴⁺ ions. DRIFT spectroscopy showed a possible mechanism of phenol adsorption on two sites, in the first one by H interaction of OH (phenol) with an OH of the catalyst and in the second, by the formation of a phenolate species between an O (OH phenol) and Mnⁿ⁺. |
| format |
Articulo Articulo |
| author |
D'Alessandro, Oriana Thomas, Horacio Jorge Sambeth, Jorge Enrique |
| author_facet |
D'Alessandro, Oriana Thomas, Horacio Jorge Sambeth, Jorge Enrique |
| author_sort |
D'Alessandro, Oriana |
| title |
An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| title_short |
An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| title_full |
An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| title_fullStr |
An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| title_full_unstemmed |
An analysis of the first steps of phenol adsorption-oxidation over coprecipitated Mn–Ce catalysts: a DRIFTS study |
| title_sort |
analysis of the first steps of phenol adsorption-oxidation over coprecipitated mn–ce catalysts: a drifts study |
| publishDate |
2012 |
| url |
http://sedici.unlp.edu.ar/handle/10915/136851 |
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Repositorios |
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1764820457407643649 |