| Popis: |
The aim of this study is to monitor the residual content of carbon, sulphur, cobalt and caesium from a cationic ion-exchange resin, Amberlite IRN 77, under pyrolysis. Resin samples were heated at five temperatures (350, 385, 400, 450 and 550°C), under nitrogen atmosphere for 30 min. For the commercial resin (undoped resin), a high residual carbon content (96% at 400°C and 90% at 550°C) was observed, in contrast with the residual sulphur content (33% at 350°C and 23% at 550°C). In the presence of cobalt and caesium, a decreased carbon content (91% at 400°C and 65% at 550°C) and, on the other hand, an increased sulphur content (74% at 350°C and 48% at 550°C) were found. As far as doped elements are concerned, a ‘critical temperature’ of 400°C seems to be a limit beyond which it is impossible to guarantee that 100% of these two elements remain within the solid residue. |
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