In the chemical recycling process of waste plastics, catalytic pyrolysis of municipal waste plastics into valuable products using FCC waste catalyst is a cost-effective solution. To improve the conversion performance of FCC waste catalyst, acid impregnation was used to remove the metallic elements deposited on the surface of FCC waste catalyst, then three kinds different modification methods, i.e., ammonia fluorosilicate, NaOH and SiCl<sub>4</sub> were used to activate the acid-treated catalyst to promote the chemical recovery of municipal waste plastics.<br/>    A co-pyrolysis of municipal waste plastics and gas oil on FCC waste catalyst and three types of activated catalysts in a conical spouted bed was investigated. The results demonstrated that the FCC waste catalyst showed weak conversion performance due to metallic elements deposited resulted in deactivation and pore blockage. For the activated catalysts, its pore structure was significantly improved, and the pore size and pore connectivity were enhanced, which promoted the diffusion of macromolecules into the active sites within the catalyst pores for conversion. Compared with FCC waste catalyst, the yield of liquid oil and light fuel oil, and the selectivity of light olefins in gas products were increased by 11.55~27.27%, 10.59~19.90%, and 16.93~48.80%, respectively, for the three types of activated FCC waste catalyst. Among of them, the FCC waste catalyst activated by NaOH presented the highest conversion performance, the conversion was up to 88.33wt%, the yield of liquid oil was 71.08wt%, and the yield of light fuel oil was 65.56wt%, which increased by 6.85%, 27.27%, and 19.90% compared with FCC waste catalyst, respectively. In addition, the selectivity of light olefins in gas products significantly increased by 48.80%.<br/>    These results indicated that the activated FCC waste catalyst could economically recycle waste plastics, solve environmental and energy problems, and realize the resource utilization of municipal waste plastics and FCC waste catalyst.

Catalytic pyrolysis of municipal waste plastics by activated FCC waste catalyst

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