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Titolo:
Changes in surface chemistry of activated carbons by wet oxidation
Autore:
Moreno-Castilla, C; Lopez-Ramon, MV; Carrasco-Marin, F;
Indirizzi:
Univ Granada, Fac Ciencias, Dept Quim Inorgan, E-18071 Granada, Spain UnivGranada Granada Spain E-18071 Quim Inorgan, E-18071 Granada, Spain Univ Jaen, Fac Ciencias Expt, Dept Quim Inorgan & Organ, Jaen 23071, SpainUniv Jaen Jaen Spain 23071 Dept Quim Inorgan & Organ, Jaen 23071, Spain
Titolo Testata:
CARBON
fascicolo: 14, volume: 38, anno: 2000,
pagine: 1995 - 2001
SICI:
0008-6223(2000)38:14<1995:CISCOA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
SNO-2-BASED BINARY CATALYSTS; METAL-OXIDE SURFACES; ACID-BASE PROPERTIES; X-RAY PHOTOEMISSION; ELECTROKINETIC PROPERTIES; OXYGEN; SITES; BLACK; XPS; DEHYDROGENATION;
Keywords:
activated carbon; oxidation; surface oxygen complexes;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Moreno-Castilla, C Univ Granada, Fac Ciencias, Dept Quim Inorgan, E-18071 Granada, Spain Univ Granada Granada Spain E-18071 071 Granada, Spain
Citazione:
C. Moreno-Castilla et al., "Changes in surface chemistry of activated carbons by wet oxidation", CARBON, 38(14), 2000, pp. 1995-2001

Abstract

A series of activated carbons with different degrees of activation were oxidized with H2O2, (NH4)(2)S2O8 and HNO3 in order to introduce different oxygen surface complexes. Changes in the surface chemistry of the activated carbons after their oxidizing treatments were studied by different techniquesincluding temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), Fourier transformed infrared spectroscopy (FTIR), titrations with HCl and NaOH, measurements of the pH of the point of zero charge and catalytic dehydration of methanol. Results showed that treatment with (NH4)(2)S2O8 fixed the lowest amount of both total oxygen and surface acid groups. However, this treatment yielded the acid groups with the highest acid strength. This could be because it favors fixation of carboxyl groups closeto other groups, such as carbonyl and hydroxyl, which enhances their acidity. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 16:39:32