Chemical recycling of waste polypropylene via thermocatalytic pyrolysis over HZSM-5 catalysts

Abstract

The present work deals with the chemical recycling of waste polypropylene viathermocatalytic pyrolysis over HZSM-5 zeolite catalysts. The main aim was tosystematically investigate the influence of reactor configuration, zeolite acidity,polypropylene wastes, obtained from different sources, as well as catalyst regener-ation on the product distribution. It was demonstrated that the reactor configura-tion and the acid site density of HZSM-5 catalysts strongly influence the productyields and distributions. The different types of polypropylene waste, on the otherhand, showed a comparatively small yet noticeable effect on the product distribu-tion. Moreover, it was demonstrated that the HZSM-5 catalysts exhibit goodregeneration capacity during regeneration-reaction cycles.