In:
Mediterranean Journal of Chemistry, Mediterranean Journal of Chemistry, Vol. 10, No. 6 ( 2020-07-02), p. 625-
Kurzfassung:
〈 p 〉 The fundamental character of the Mg-Al mixed oxide (Mg 〈 sub 〉 n 〈 /sub 〉 (Al)O), derived from the Mg-Al hydrotalcite (Mg 〈 sub 〉 n 〈 /sub 〉 Al-CO 〈 sub 〉 3 〈 /sub 〉 -HT), where n corresponds to the Mg/Al molar ratio (n: 2, 2.5, 3, 3.5 and 4), was studied by using the adsorption of phenol as a probe acid molecule. The hydrotalcite precursors were prepared by the coprecipitation method. Their derived mixed oxides were obtained by thermal treatment at 450°C in a flow of air. The resulting solids were characterized by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), infrared spectroscopy (FTIR), thermogravimetric and differential thermal analysis (TG-DTA), nitrogen physisorption (BET) and phenol chemisorption. The phenol adsorption followed by UV-Visible spectrophotometry shows that the basicity increases with the Mg/Al molar ratio, such that maximum quantity of phenol adsorbed (Q 〈 sub 〉 ads 〈 /sub 〉 = 0.54 mmol/g 〈 sub 〉 cat 〈 /sub 〉 ) was obtained with the mixed oxide derived from the Mg-Al hydrotalcite of Mg/Al molar ratio equal to 3.5. 〈 /p 〉
Materialart:
Online-Ressource
ISSN:
2028-3997
DOI:
10.13171/mjc10602007021464sa
Sprache:
Unbekannt
Verlag:
Mediterranean Journal of Chemistry
Publikationsdatum:
2020
ZDB Id:
2735401-5
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