MODIFIED HZSM-5 CATALYZED CO-PYROLYSIS OF CORN STOVER AND HDPE TO BTEXN

Li Yanji; Zhao Ming; Li Mingze; Song Ruiwen

doi:10.19912/j.0254-0096.tynxb.2021-1534

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 238-246. DOI: 10.19912/j.0254-0096.tynxb.2021-1534

MODIFIED HZSM-5 CATALYZED CO-PYROLYSIS OF CORN STOVER AND HDPE TO BTEXN

Li Yanji, Zhao Ming, Li Mingze, Song Ruiwen

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Abstract

To improve the yield of BTEXN and light olefins in co-pyrolysis of biomass with polyethylene while inhibiting the formation of $C^{+}_{21}$ waxes, the effects of HZSM-5 and modified HZSM-5 in catalytic co-pyrolysis on the interaction between corn stover and HDPE are investigated by TG-MS/FTIR and Py-GC/MS. The results show that in the catalytic co-pyrolysis of HZSM-5, HZSM-5 promotes the mutual reaction between corn stover and HDPE, and the aromatic and light hydrocarbon yields increase. Compared with HZSM-5, in the catalytic co-pyrolysis of modified HZSM-5, modified HZSM-5 promotes the precipitation of light olefins, C₅-C₁₁ aliphatic hydrocarbons and aromatics, and inhibits the formation of $C^{+}_{21}$ waxes. Cu, Fe and Ce modifications promote monocyclic aromatic hydrocarbon formation while increasing BTEXN yield by 20.99 mg/g, 25.43 mg/g and 20.89 mg/g respectively, compared to HZSM-5. Inversely, P modification inhibits BTEXN formation. For the Diels-Alder reaction, which forms aromatics, Fe and Ce modifications show stronger catalytic effect, while Cu modifications are more effective in catalyzing the hydrocarbon pool reaction. In addition, carbon accumulation analysis show that Fe and P modifications have stronger resistance to carbon accumulation.

Key words

biomass / high density polyethylene / pyrolysis / BTEXN / HZSM-5

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Li Yanji, Zhao Ming, Li Mingze, Song Ruiwen. MODIFIED HZSM-5 CATALYZED CO-PYROLYSIS OF CORN STOVER AND HDPE TO BTEXN[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 238-246 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1534

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