Influence of the preparation conditions on the synthesis of high surface area SiC for use as a heterogeneous catalyst support

Citation
N. Keller et al., Influence of the preparation conditions on the synthesis of high surface area SiC for use as a heterogeneous catalyst support, J MATER SCI, 34(13), 1999, pp. 3189-3202
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS SCIENCE
ISSN journal
0022-2461 → ACNP
Volume
34
Issue
13
Year of publication
1999
Pages
3189 - 3202
Database
ISI
SICI code
0022-2461(19990701)34:13<3189:IOTPCO>2.0.ZU;2-1
Abstract
The influence of different parameters (temperature, duration and SiO source ) on the synthesis of silicon carbide SIC according to the gas-solid reacti on between SiO vapors and activated charcoal was investigated. The material obtained retained the general shape of the activated charcoal, which is an advantage because of the difficulty in post shaping SIG, due to the high s trength of the material. High temperature (>1250 degrees C) and long reacti on duration led to a high C* --> SiC conversion but with a relatively low s urface area (20-25 m(2).g(-1)) due to sintering via the surface diffusion p henomenon. The combination of a lower reaction temperature (1200 degrees C) , longer reaction duration (15 h) and high (Si + SiO2)/C* weight ratio allo wed SiC to be obtained with a surface area of around 50 m(2).g(-1), which c an be used as a support material for heterogeneous catalysis. (C) 1999 Kluw er Academic Publishers.