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Titre
Activated carbon surface chemistry: Changes upon impregnation with Al(III), Fe(III) and Zn(II)-metal oxide catalyst precursors from NO3− aqueous solutions
Autor(es)
Sujet
Activated carbon
Catalyst support
Al(III)
Fe(III)
Zn(II)
Surface chemistry
Clasificación UNESCO
2303 Química Inorgánica
3321.02 Productos Químicos derivados del Carbón
Fecha de publicación
2019
Éditeur
Elsevier
Citación
Barroso-Bogeat, A., Alexandre-Franco, M., Fernández-González, C., Gómez-Serrano, V. (2019). Activated carbon surface chemistry: Changes upon impregnation with Al(III), Fe(III) and Zn(II)-metal oxide catalyst precursors from NO3− aqueous solutions, Arabian Journal of Chemistry, 12 pp 3963-3976. http://dx.doi.org/10.1016/j.arabjc.2016.02.018
Resumen
[EN] Because of the relevance in heterogeneous catalysis, the changes produced in the surface
chemistry of activated carbon (AC) upon impregnation with the Al3+, Fe3+ and Zn2+ ions from
aqueous solution of NO3
salts at pH 2.91 for Al3+, 1.54 for Fe3+ and 5.16 for Zn2+ in two successive
soaking and oven-drying steps are studied. The samples (A120, F120 and Z120) were analyzed
in terms of elemental composition and by energy dispersive X-ray analysis (EDX), FT-IR
spectroscopy, X-ray photoelectron spectroscopy (XPS), and measurement of pH of the point of
zero charge (pHpzc). The process yield was 102 wt% for A120, 114 wt% for F120, and 103 wt%
for Z120. Chromene, pyrone and ether type structures are by far predominant in AC. The hydrolysis
of metal ions markedly influences the pH of the impregnation solution and thereby the oxidation
of surface functional groups of AC by O2 and NO3
dissolved in such a solution. The degree of
AC oxidation is larger with the Fe3+ solution than with the Al3+ and Zn2+ solutions. Carboxylic
acid groups for F120 and phenolic hydroxyl groups for Z120 and especially for A120 are formed
from reducing structures of AC. The nitrogen content is higher by Z120 > A120 >F120 > AC.
pHpzc is 10.50 for AC, 5.20 for A120, 4.00 for F120 and 6.30 for Z120.
2016 The Authors. Published by Elsevier B.V. on behalf of King Saud University. This is an open
access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
URI
ISSN
1878-5352
DOI
10.1016/j.arabjc.2016.02.018
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