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Título

Tuning of texture and surface chemistry of carbon xerogels

AutorMahata, N.; Pereira, M. F. R.; Suárez García, Fabián ; Martínez Alonso, Amelia ; Díez Tascón, Juan Manuel ; Figueiredo, José Luís
Palabras claveCarbon xerogel
Surface activation
Oxygen plasma
Catalyst support
Fecha de publicación10-may-2008
EditorElsevier
CitaciónJournal of Colloid and Interface Science 324(1-2): 150-155 (2008)
ResumenThe influence of different activation processes on the textural and surface chemical properties of carbon xerogels was studied. Carbon xerogels were prepared by the conventional sol–gel approach using resorcinol and formaldehyde; two different pHs of sol–gel processing led to carbon materials with distinct pore size distributions. The materials were subjected to controlled activation by three different methods: activation by oxygen plasma, activation by HNO3, and activation by diluted air. Treatments with HNO3 and diluted air created oxygen groups on the external surface as well as inside the pore channels, whereas plasma is more suitable for introducing oxygen groups selectively on the external surface. Nevertheless, it was shown that samples with wider pores can be oxidized to some extent on the pore interiors by plasma. Significant changes in total surface area by air activation were observed.
Descripción6 pages, 4 figures, 5 tables.-- PMID: 18533175 [PubMed].-- Printed version published Aug 2008.
Versión del editorhttp://dx.doi.org/10.1016/j.jcis.2008.05.006
URIhttp://hdl.handle.net/10261/11708
DOI10.1016/j.jcis.2008.05.006
ISSN0021-9797
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