Pyrolysis of scrap tire for preparation of a ctiva ted carbon

C. Srinivasakannan, N. Balasubramanian

Research output: Contribution to journalArticlepeer-review


The presented work is an attempt to produce activated carbon from the pyrolytic char of the scrap tire, using phosphoric acid as the activating agent. Towards this, as a first step, pyrolytic char was prepared from scrap tires covering a temperature range of 400 to 800°C. The yield of the char was found to vary in a narrow range of 33 to 35% for the temperatures exceeding 450°C. The resultant pyrolytic char was impregnated with phosphoric acid and activated at 500°C, for duration of activation ranging from 45 to 150 minutes, for impregnation ratios of 1 and 1.5. An impregnation ratio of 1 was found to yield 42%, with a methylene blue number of 184mg/g, while an impregnation ratio of 1.5, yielded 52% with methylene blue number of 139mg/g. The methylene blue number was found to increase with increase in activation time or with decrease in the yield of the activated carbon. The BET surface area was found to increase with increase in the methylene blue number from 302m 2g-1 to 545m2g-1. While all the earlier work using chemical activation reports activation temperature around 800°C, in an inert atmosphere, the present process demands only 500°C, in a self generated atmosphere, to produce activated carbon of comparable quality.

Original languageBritish English
Pages (from-to)95-103
Number of pages9
JournalJournal of Solid Waste Technology and Management
Issue number2
StatePublished - May 2009


  • Char
  • Methylene blue
  • Phosphoric acid activation
  • Pyrolysis


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