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Surface morphology and chemistry of commercial carbon black and carbon black from vacuum pyrolysis of used tyres

✍ Scribed by Bendida Sahouli; Silvia Blacher; François Brouers; Hans Darmstadt; Christian Roy; Serge Kaliaguine

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
889 KB
Volume
75
Category
Article
ISSN
0016-2361

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✦ Synopsis

The surface chemistry and morphology of carbon blacks obtained by pyrolysis of used tyres (CBr) and of commercial carbon blacks was investigated by electron spectroscopy for chemical analysis (ESCA), secondary ion mass spectrometry (SIMS) and fractal analysis using nitrogen adsorption data and smallangle X-ray scattering (SAXS). In contrast to commercial carbon blacks, carbonaceous deposits are formed on the CBr. surface. The concentration of these carbonaceous deposits depends on the pyrolysis conditions, decreasing with decreasing pyrolysis pressure and increasing pyrolysis temperature. The carbon black surface is smoothed by the carbonaceous deposits. A relation exists between the fractal dimension, or roughness, of the CBp surface and the amount of carbonaceous deposits at constant pyrolysis temperature. The surface chemistry and morphology of CBp from pyrolysis at low pressures are similar to those of commercial rubber-grade carbon blacks.

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