作者: Cristian I. Contescu , Tyler Guldan , Peng Wang , Timothy D. Burchell
DOI: 10.1016/J.CARBON.2012.01.040
关键词: Porosity 、 Chemisorption 、 Thermogravimetric analysis 、 Microstructure 、 Nuclear graphite 、 Chemical engineering 、 Graphite 、 Materials science 、 Activation energy 、 BET theory
摘要: Abstract Oxidation resistance in air of three grades nuclear graphite with different structures was compared using a standard thermogravimetric method. Differences the oxidation behavior have been identified respect to both (i) rate identical conditions and derived apparent activation energy pre-exponential factor (ii) penetration depth oxidant development oxidized layer. These differences were ascribed structural between grades, particular grain size shape filler, associated textural properties, such as total BET surface area porosity distribution un-oxidized material. It also found that amount strongly bonded oxygen complexes measured by thermodesorption significantly exceeds afforded low area, therefore temperature chemisorption is not reliable method for determining sites (re)active during oxidation. The relationship microstructure its demonstrated this work underlines importance performing comprehensive characterization studies new considered candidates very high gas-cooled reactors.