title: Carbon and SiC macroscopic beads from ion-exchange resin templates.
abstract: A method for preparing carbon and SiC macroscopic beads using ion-exchange resins as a macrotemplate that determines the macroshape and the pore structure of the product materials is reported. First, silicates are ion-exchanged into the resins to prevent the resin from collapsing during subsequent carbonization and allow them to be used as precursors for SiC formation. SiC is prepared via carbothermal reduction of carbon/silica composite beads obtained upon carbonization of the resin/silicate in an inert atmosphere. Finally, silica is removed by HF etching. Very high-surface area (1670-2026 m2 g-1) micro- or micro-/mesoporous carbon beads and relatively high-surface area (35-63 m2 g-1) macro- and meso-/macroporous SiC beads were prepared by the described method. The pore structure and the macroshape of the particles were controlled by the type of ion-exchange resins employed, gel or macroreticular.
authors.affiliation: Laboratoire de Matériaux Minéraux, UMR-7016 CNRS, ENSCMu, Université de Haute Alsace, 3, rue Alfred Werner, 68093 Mulhouse Cedex, France. l.tosheva@uha.fr
authors.forename: Lubomira
authors.initials: L
authors.lastname: Tosheva
authors.forename: Julien
authors.initials: J
authors.lastname: Parmentier
authors.forename: Seifedine
authors.initials: S
authors.lastname: Saadallah
authors.forename: Cathie
authors.initials: C
authors.lastname: Vix-Guterl
authors.forename: Valentin
authors.initials: V
authors.lastname: Valtchev
authors.forename: Joël
authors.initials: J
authors.lastname: Patarin