Effects of catalyst and catalytic mode on co?pyrolysis characteristics of biomass and plastics

Abstract

Abstract: Catalytic co-pyrolysis of biomass and plastic is a promising way to improve bio-oil quality and mitigate the environmental issues caused by the disposal of petroleum-based waste plastics. In this study， the effects of in-situ and ex-situ catalytic modes on the performance of co-pyrolysis were investigated using HZSM-5 as a catalyst. Three types of catalysts， HY， HZSM-5 and Fe/HZSM-5， were then thoroughly characterized， and their effects on the performance of co-pyrolysis were also investigated. The in-situ mode resulted in a higher bio-oil yield compared to the ex-situ mode. However， the Diels-Alder and aromatization reactions were promoted in the ex-situ pyrolysis， leading to a higher aromatic selectivity of 82.8 %. The introduction of transition metal Fe improved the anti-coking ability； therefore， Fe/HZSM-5 had the least coke amounts of 3.77 wt% among the three catalysts. Compared to HZSM-5， Fe/HZSM-5 had a lower Br?nsted acid density， thus leading to a slight decrease in the selectivity of hydrocarbons but a dramatic increase in the selectivity of aromatics by 16.7 %. Owing to the coke deposition， the BET surface area， pore volume， and there was a decrease in the acidity of the three post-catalytic catalysts， lowering their catalytic ability.

Key words: biomass, plastic, co-pyrolysis, catalytic mode, deactivation

References

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