Co-pyrolysis kinetic characteristics of wheat straw and hydrogen rich plastics based on TG-FTIR and Py-GC/MS

Na Guo, Zhiwei Wang, Gaofeng Chen, Mengju Zhang, Huina Zhu, Qun Wang, Shuaihua Guo, Feihong Su, Zhenxiang You, Shuhua Yang, Zhimin Du, Yongzhi Liu and Tingzhou Lei

Energy, 2024, vol. 312, issue C

Abstract: The pyrolysis of various plastics generates distinct reaction intermediates, influencing co-pyrolysis with biomass feedstocks in varied manners. This work investigated the co-pyrolysis characteristics of hydrogen-rich plastics (PP, PS, PE) and wheat straw (WS) at 600 °C. The experimental results indicated that the co-pyrolysis of WS with hydrogen-rich plastics increased the release of alkenes and decreased the release of oxy-organics and polycyclic aromatic hydrocarbons (PAHs). The synergistic mechanism of co-pyrolysis was closely related to the type of plastics used. FTIR analysis revealed that the co-pyrolysis products of WS and plastics included hydrocarbons, aldehydes, ketones, alcohols, acids, phenols, and H2O. Co-pyrolysis effectively enhanced the proportion of combustible gas. The co-pyrolysis of WS and PP increased the yield of MAHs and alcohols. The co-pyrolysis of WS and PS decreased the formation of PAHs and acids. The co-pyrolysis of WS and PE reduced the yield of N-compounds and acids. Compared to single pyrolysis, the product yields from co-pyrolysis of WS and hydrogen-rich plastics were significantly enhanced, especially alkenes and alcohols. The synergistic interaction between WS and PP, PS, PE contributed to enhancing the quality of co-pyrolysis bio-oil. Additionally, the research also provided a theoretical foundation for the efficient co-conversion of biomass and plastics.

Keywords: Wheat straw; Plastics; Co-pyrolysis; TG-FTIR; Py-GC/MS (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:312:y:2024:i:c:s0360544224034613

DOI: 10.1016/j.energy.2024.133683

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