The first preparation of silicon carbide nanotubes by shape memory synthesis and their catalytic potential

Citation
C. Pham-huu et al., The first preparation of silicon carbide nanotubes by shape memory synthesis and their catalytic potential, J CATALYSIS, 200(2), 2001, pp. 400-410
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
JOURNAL OF CATALYSIS
ISSN journal
0021-9517 → ACNP
Volume
200
Issue
2
Year of publication
2001
Pages
400 - 410
Database
ISI
SICI code
0021-9517(20010610)200:2<400:TFPOSC>2.0.ZU;2-E
Abstract
Two main innovations are presented in this article. (1) The first reproduci ble synthesis of silicon carbide nanotubes of different internal and extern al diameters, The method used, the shape memory synthesis, is based on the gas-solid reaction between a vapor of SiO and nanotubes of carbon for the h igh diameters, and nanofibers of carbon for the small diameters. (2) A sign ificant increase in the rate of a catalytic reaction (oxidation of H2S in S ) probably due to a microscopic increase of the partial pressure of H2S ins ide the nanotubes, produced by condensation and microcapillarity, while the macroscopic partial pressure outside the tubes remains unchanged. This phe nomenon could be extended to many other reactions, with polar gaseous react ants which are prone to condensation by capillarity at the usual temperatur es of catalytic reaction, or with liquid phase reaction by an overconcentra tion of one of the reactants inside the tubes. (C) 2001 Academic Press.