The recycling of plastic waste is important both in the conservation of resources and the environment. A plastic waste (polyethylene(PE)/polypropylene(PP)/polystyrene(PS)/polyvinyl chloride(PVC)) was pyrolyzed over a series of post-use fluid catalytic cracking (FCC) catalysts using a fluidizing reaction system similar to the FCC process operating isothermally at ambient pressure. Experiments carried out with these catalysts gave good yields of valuable hydrocarbons with differing selectivity in the final products dependent on reaction conditions. A model based on kinetic considerations associated with chemical reactions and catalyst deactivation in the catalytic degradation of plastics has been developed. Greater product selectivity was observed with a hybrid catalyst (SAHA/CAT-R1) of amorphous silica-aluminas (SAHA) and a recycle FCC catalyst with regeneration (CAT-R1) with more than 68.6 wt. % olefins products. It is demonstrated that the catalytic degradation of postconsumer plastics over these recycled catalysts using fluidizing cracking reactions was shown to be a useful method for the production of potentially valuable hydrocarbons.

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