Catalytic pyrolysis of waste tire using noble metals-supported HMOR catalysts
Abstract
The catalytic pyrolysis of waste tire over bifunctional catalysts, based on noble metals (Pt, Ru, Re, Rh) supported on HMOR zeolite, was investigated in a semi-batch reactor. The prepared catalysts were characterised by H2-chemisorption, TPR, TPD of H2 and NH3, XRD, N2-adsorption/desorption and ICP, whereas the spent catalysts were analysed by TPO and XRF. The pyrolysis results indicated an important increase in the yield of gaseous product at the expense of liquid yield when the bifunctional catalysts were introduced. Moreover, the contents of polycyclic and polar-aromatics decreased drastically for all prepared catalysts; and, the reduction of aromatics was more pronounced for poly- and polar-aromatics than for di-aromatics. As a consequence, the derived oils were much lighter and contained high concentration of saturates. The catalytic activity of the studied catalysts for light oil production as well as aromatic reduction can be summarised as followed: Ru/HMOR > Rh/HMOR > Pt/HMOR >> Re/HMOR. Additionally, the catalytic activity under the studied conditions for the current catalysts was independent on the metal dispersion as well as the total concentration of acid sites, but dependent on the intrinsic nature of the metal used. The best performance of Ru catalyst was found to relate to its highest sulfur tolerance and coke resistance.
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