*4.3. Gas from Waste Tyre*

The gas obtained from waste tyre pyrolysis is called pyrogas or syngas. It is normally a mixture of hydrogen (H2) and olefins, and paraffins with carbon numbers ranging from one to six (C2–C6) with a low concentration of nitrogen (N2) and sulphur (S) compounds [100,101]. The syngas' calorific value ranges from 50 to 70 MJ/m<sup>3</sup> [93–95]. It has been commonly reported that the syngas produces from waste tyre pyrolysis is sufficient for supplying the required heat for the process [18,73,102,103].
