Table 1 shows the elemental analysis of the original char and carbons obtained for different activation times.
The char obtained by pyrolysis has a similar composition to coal, mainly made up of carbon, with limited hydrogen and nitrogen contents. The ash content is in all cases around 10%,which ismostly ZnO.
In fact, the starting material we used for pyrolysis is vulcanized rubber without steel chords or other additives. The pyrolytic char in the pyrolysis process has a considerable sulphur content due to the addition of this compound as vulcanization agent.
This content is a problem for pyrolytic char reuse as carbon black,given that sulphur content for this purpose must be lower than 1% [36].
Apart from the improvement of char surface properties during the steam activation process, an important reduction in sulphur content is attained, which has also been observed by other authors [32,37] but has been scarcely commented in the literature.
It should be noted that sulphur content is a specification of commercial active carbons, so the reduction in sulphur content could be the key for the industrial application of tyre-derived-carbons.
Table 1 shows the elemental analysis of the original char and carbons obtained for different activation times. The char obtained by pyrolysis has a similar composition to coal, mainly made up of carbon, with limited hydrogen and nitrogen contents. The ash content is in all cases around 10%,which ismostly ZnO. In fact, the starting material we used for pyrolysis is vulcanized rubber without steel chords or other additives. The pyrolytic char in the pyrolysis process has a considerable sulphur content due to the addition of this compound as vulcanization agent. This content is a problem for pyrolytic char reuse as carbon black,given that sulphur content for this purpose must be lower than 1% [36]. Apart from the improvement of char surface properties during the steam activation process, an important reduction in sulphur content is attained, which has also been observed by other authors [32,37] but has been scarcely commented in the literature. It should be noted that sulphur content is a specification of commercial active carbons, so the reduction in sulphur content could be the key for the industrial application of tyre-derived-carbons.
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